CN109350005B - Optical system for binocular fatigue measuring device - Google Patents

Abstract

The invention discloses an optical system for a binocular fatigue measuring device, which includes a bi-telecentric lens, an infrared camera, an infrared lighting source, a stimulus light and flash fusion frequency integration module, a reflector and a dichroic mirror; A stimulation surface light source is provided on the surface of the stimulation light and flash fusion frequency integrated module, and a bright spot light source is provided in the center of the stimulation surface light source. By arranging two bi-telecentric lenses, each lens only images a single human eye, the invention improves the measurement accuracy of the pupil diameter of the light reflection time by the instrument; the stimulation light source module and the critical flash fusion frequency module of the invention are integrated The design reduces the size of the device, and the stimulation light source adopts a multi-color surface light source design, which has high illumination uniformity. When measuring pupillary light reflection, the discomfort of the human eye is significantly reduced, and multi-color pupillary light reflection can also be measured. Measurement.

Description

Optical system for binocular fatigue measurement device

Technical field

The present invention relates to the technical field of fatigue detection, and in particular to an optical system for a binocular fatigue measurement device.

Background technique

With the development and progress of society, people's work and life pressures are increasing. Continuous physical labor and mental work lead to people often working in a fatigued state. Working in a fatigued state not only has low work efficiency, but also, importantly, It is accompanied by risks such as production and personal safety.

When the human eye is stimulated by light, the pupil shrinks, which is called the pupillary light reflex. The contraction of the pupil is completed by the pupillary sphincter controlled by the parasympathetic nerve in the oculomotor nerve, and the dilation of the pupil is completed by the pupillary dilator muscle controlled by the sympathetic nerve. The two coordinate and restrict each other in the center, thereby achieving complex pupillary light reflex control. The time it takes for the diameter of the pupil to go from the largest to the smallest diameter under the stimulation of external light is called the pupillary light reflex time. When a person is in a fatigue state, the pupil light reflection time is longer than when the human body is in a mental state.

The critical flash fusion frequency is the lowest flash frequency at which subjects perceive flashing light as continuous light. It is one of the more recognized and commonly used fatigue evaluation methods at home and abroad. In the state of fatigue, due to the tendency of central function to inhibit inhibitory changes, arousal is reduced, and the critical flash fusion frequency of the human body decreases.

The shortcomings of existing inspection equipment and methods are:

1. The measurement lens used in the existing device is a single ordinary objective lens, and there is an error in the measurement of the pupil diameter during light reflection.

2. When performing pupillary light reflex, the stimulation light source is a single high-brightness white LED, which will obviously cause discomfort to the human eye, and the stimulation color is single.

The device is not highly integrated, and the stimulation light source module and critical flash fusion frequency module are designed separately, which increases the size of the device.

Contents of the invention

The technical problem to be solved by the present invention is to provide an optical system for a binocular fatigue measuring device in view of the above-mentioned deficiencies in the prior art.

In order to solve the above technical problems, the technical solution adopted by the present invention is: an optical system for a binocular fatigue measurement device, including a bi-telecentric lens, an infrared camera, an infrared illumination source, a stimulation light and a flash fusion frequency integration module, Reflectors and dichroic mirrors;

The surface of the stimulation light and flash fusion frequency integrated module is provided with a stimulation surface light source, and a bright spot light source is provided in the center of the stimulation surface light source;

The stimulation light and flash point light emitted by the stimulation light and flash fusion frequency integration module are reflected by the reflecting mirror and then reach the dichroic mirror, and then are reflected by the dichroic mirror to the human eye; the reflected light of the human eye The illumination light emitted by the infrared illumination source is transmitted through the dichroic mirror, and then reaches the infrared camera after passing through the bi-telecentric lens.

Preferably, the bi-telecentric lens includes two for imaging the left and right eyes respectively, and the infrared camera includes two that are detachably connected to the bi-telecentric lens.

Preferably, one end of the bi-telecentric lens is provided with a connecting sleeve, and one end of the camera is provided with a connecting sleeve; the connecting sleeve is used to be inserted into the connecting sleeve to achieve the above Detachable connection of bi-telecentric lens to camera.

Preferably, the end face of the connecting cannula is provided with a positioning plug, the other end of the positioning plug has an arc-shaped end face, the inner wall of the connecting sleeve is provided with a positioning block, and the positioning block is provided with a positioning block. There is a positioning hole for the positioning plug to be inserted.

Preferably, the inner wall of the positioning hole is provided with an arc-shaped elastic piece, and the outer wall of the positioning plug is provided with an arc-shaped groove for accommodating the arc-shaped elastic piece.

Preferably, the positioning hole is a rectangular hole, and the arc-shaped elastic pieces are provided on its two opposite inner walls; the positioning plug is a rectangular cylinder, and the arc-shaped spring pieces are provided on its two opposite outer walls. groove.

Preferably, an installation groove is provided on the inner wall of the connecting sleeve, and a locking piece is provided in the installation groove;

The locking member includes a pillar connected to the inner wall of the installation slot, a horizontal plate rotatably connected to the pillar, a pressing block connected to one end of the horizontal plate, and a lock connected to the other end of the horizontal plate. The locking block and the first spring are connected between the locking block and the inner wall of the installation groove.

Preferably, the outer wall of the connecting sleeve is provided with an opening penetrating to the installation groove for the pressing block to protrude.

Preferably, a chuck is connected to the upper end of the pressure block, and a second spring is connected between the chuck and the outer wall of the connecting sleeve.

Preferably, the outer wall of the connecting tube is also provided with a locking groove for the locking block to be inserted.

The beneficial effects of the present invention are: by setting up two bi-telecentric lenses, each lens only images a single human eye, the instrument improves the measurement accuracy of the pupil diameter of the light reflection time; the stimulation light source module of the present invention and The integrated design of the critical flash fusion frequency module reduces the size of the device, and the stimulation light source adopts a multi-color surface light source design with high illumination uniformity. When measuring pupillary light reflection, the discomfort of the human eye is significantly reduced, and it can Perform multicolor pupillary light reflectance measurements. The invention determines the fatigue state of the human body through the measurement of the pupil's light reflection time and the comprehensive measurement of the critical flash fusion frequency, has high detection accuracy and has good application prospects.

Description of drawings

Figure 1 is a schematic structural diagram of the optical system used in the binocular fatigue measurement device of the present invention;

Figure 2 is a schematic structural diagram of the stimulation light and flash fusion frequency integration module of the present invention;

Figure 3 is an exploded view of the bi-telecentric lens and infrared camera of the present invention;

Figure 4 is a schematic cross-sectional structural view of the connecting sleeve of the present invention;

Figure 5 is a partially enlarged structural schematic diagram of the locking member of the present invention;

Figure 6 is a schematic cross-sectional structural view of the connecting cannula of the present invention;

Figure 7 is a schematic structural diagram of the positioning insertion post of the present invention;

Figure 8 is a schematic structural diagram of the connecting sleeve and the connecting cannula of the present invention.

Explanation of reference symbols:

1—Bi-telecentric lens; 2—Infrared camera; 3—Infrared illumination source; 4—Stimulation light and flash fusion frequency integrated module; 5—Reflector; 6—Dichroic mirror; 7—Human eye; 8—Connection sleeve tube; 9—connecting intubation tube; 40—stimulating surface light source; 41—bright spot light source; 80—positioning block; 81—positioning hole; 82—arc shrapnel; 83—installation slot; 84—locking piece; 90—positioning insert Column; 91—Arc end face; 92—Arc groove; 93—Lock groove; 840—Pillar; 841—Horizontal plate; 842—Pressure block; 843—Lock block; 844—First spring; 845—Open Hole; 846—chuck; 847—second spring.

Detailed ways

The present invention will be further described in detail below with reference to the examples, so that those skilled in the art can implement it according to the text of the description.

It should be understood that terms such as "having," "comprising," and "including" as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

As shown in Figures 1-8, an optical system for a binocular fatigue measurement device in this embodiment includes a bi-telecentric lens 1, an infrared camera 2, an infrared illumination source 3, and a stimulus light and flash fusion frequency integration module. 4. Reflector 5 and dichroic mirror 6.

The stimulation light and flash fusion frequency integrated module 4 is provided with a stimulation surface light source 40 on its surface, and a bright spot light source 41 is provided in the center of the stimulation surface light source 40 . The stimulation light and flash fusion frequency integration module 4 includes light sources of multiple colors, in a preferred embodiment, 4 types.

The stimulus light and flash point light emitted by the frequency integration module 4 are reflected by the reflector 5 and then reach the dichroic mirror 6, and then are reflected by the dichroic mirror 6 to the human eye 7; the reflected light and infrared light of the human eye 7 The illumination light emitted by the illumination light source 3 is transmitted through the dichroic mirror 6, and then passes through the bi-telecentric lens 1 before reaching the infrared camera 2;

Among them, the integrated design of the stimulation light source module and the critical flash fusion frequency module reduces the size of the device, and the stimulation light source adopts a multi-color surface light source design with high illumination uniformity. When measuring pupil light reflection, the human eye is 7 Discomfort is significantly reduced and multi-color pupillary light reflex measurements are also possible.

The bi-telecentric lens 1 includes two for imaging the left and right eyes respectively, and the infrared camera 2 includes two that are detachably connected to the bi-telecentric lens 1 . Each lens only images a single human eye 7 , which improves the instrument’s accuracy in measuring the pupil diameter of light reflection time.

By adopting the optical system of the present invention and combining it with other necessary external auxiliary equipment, a binocular fatigue measuring device can be used to measure the pupil light reflection time to determine the fatigue state of the human body. Necessary external auxiliary equipment generally includes software processing systems for calculating and analyzing measurement data and some conventional mechanical components.

In one embodiment, the process of measuring the pupil light reflection time using a binocular fatigue measuring device based on the optical system of the present invention is: first, open and set the bright spot light source 41 of the stimulus light and flash fusion frequency integration module 4 It is always bright, and the image of the bright spot light source 41 is reflected by the reflector 5 and the dichroic mirror 6, providing an observation target for the human eye 7 to maintain the stability of the human eye 7 during measurement. Then the infrared illumination source 3 is turned on at the same time to illuminate the human eye 7. At this time, the image of the human eye 7 reaches the infrared camera 2 through the dichroic mirror 6 and the bi-telecentric lens 1. After the image of the human eye 7 remains stable, the stimulation surface light source 40 of the stimulation light and flash fusion frequency integration module 4 is turned on to complete the light stimulation of the human eye 7 . Then the software system in the device calculates the pupil light reflection time. When measuring the critical flash fusion frequency, the stimulation surface light source 40 of the stimulation light and flash fusion frequency integration module 4 is set to always bright, and the critical flash fusion frequency of the human eye 7 is measured by adjusting the flashing frequency of the bright spot. Through the comprehensive measurement of the pupil light reflection time and the critical flash fusion frequency, the fatigue state of the human body can be judged.

One end of the bi-telecentric lens 1 is provided with a connecting sleeve 8, and one end of the camera is provided with a connecting sleeve 9; the connecting sleeve 9 is used to be inserted into the connecting sleeve 8 to realize the connection between the bi-telecentric lens 1 and the camera. Removable connection. The bi-telecentric lens 1 and the camera can be installed and disassembled conveniently and quickly, which can improve the convenience of installation and use.

The end face of the connecting cannula 9 is provided with a positioning plug 90, and the other end of the positioning plug 90 has an arc-shaped end face 91. The inner wall of the connecting sleeve 8 is provided with a positioning block 80, and the positioning block 80 is provided with a positioning plug. 90 fits into the inserted positioning hole 81. The connecting sleeve 8 is also provided with an alignment mark line (not shown in the figure), and the alignment mark line, the positioning hole 81 and the positioning plug 90 are on the same straight line.

The inner wall of the positioning hole 81 is provided with an arc-shaped elastic piece 82, and the outer wall of the positioning plug 90 is provided with an arc-shaped groove 92 for accommodating the arc-shaped elastic piece 82. Referring to Figures 5 and 7, in a preferred embodiment, the positioning hole 81 is a rectangular hole, and its two opposite inner walls are provided with arc-shaped elastic pieces 82; the positioning plug 90 is a rectangular cylinder, and its two opposite outer walls Arc grooves 92 are provided on both sides. The positioning plug 90 breaks through the arc-shaped spring piece 82 through its arcuate end face 91 and is inserted into the positioning hole 81. The curved spring pieces 82 on the upper and lower inner walls of the positioning hole 81 are engaged with the arc-shaped spring pieces 82 on the upper and lower outer walls of the positioning plug 90. The groove 92 is extruded to lock the positioning plug 90, thereby facilitating the positioning plug 90 to be installed in place, and allowing the positioning plug 90 to be stably stuck in the positioning hole 81, thereby improving the stability of the connection.

The bi-telecentric lens 1 and the camera are detachably connected and locked through the locking member 84, which facilitates the installation and replacement of the bi-telecentric lens 1 and the camera, and improves the convenience of use. Specifically, referring to Figure 7, in one embodiment, a mounting slot 83 is provided on the inner wall of the connecting sleeve 8, and a locking piece 84 is provided in the mounting slot 83; the locking piece 84 includes an inner wall connected to the mounting slot 83. The pillar 840, the horizontal plate 841 rotatably connected to the pillar 840, the pressing block 842 connected to one end of the horizontal plate 841, the locking block 843 connected to the other end of the horizontal plate 841, and the locking block 843 and the installation groove 83 The first spring 844 is between the inner walls. The outer wall of the connecting sleeve 8 is provided with an opening 845 penetrating to the installation groove 83 for the pressure block 842 to extend. The upper end of the pressure block 842 is also connected to a chuck 846, and a second spring 847 is connected between the chuck 846 and the outer wall of the connecting sleeve 8. The outer wall of the connecting cannula 9 is also provided with a locking groove 93 for the locking block 843 to be inserted.

Referring to Figure 3, the connecting sleeve 8 is provided at the right end of the bi-telecentric lens 1, and the camera 1 is connected to the right end of the bi-telecentric lens 1 through the connecting sleeve 9. When connecting and installing the bi-telecentric lens 1 with the camera, first align the positioning plug 90 on the connecting tube 9 with the alignment mark line on the connecting sleeve 8 (to achieve the alignment of the positioning plug 90 and the positioning hole 81 ), and then press the pressing block 842 inward, the pressing block 842, the chuck 846 and the horizontal plate 841 at this end move downward, the chuck 846 compresses the second spring 847, and under the rotation support of the pillar 840, the other end of the horizontal plate 841 Squeeze the first spring 844 and move it upward to make the locking block 843 retract into the installation groove 83; then insert the connecting cannula 9 into the connecting sleeve 8 and go deep into the bottom to make the positioning plug 90 on the connecting cannula 9 fit. Insert it into the positioning hole 81, and at the same time, the locking groove 93 on the outer wall of the connecting tube 9 moves below the locking block 843; then loosen the pressing block 842, and the first spring 844 presses the locking block 843 downward. The two springs 847 press the chuck 846 upward, and the transmission effect of the horizontal plate 841 also exerts downward pressure on the locking block 843. The locking block 843 moves downward and is locked into the locking groove 93 to achieve locking. Tightly, complete the connection between the bi-telecentric lens 1 and the camera. When disassembling, first press the pressing block 842 to disengage the locking block 843 from the locking groove 93 to unlock, and then pull out the connecting tube 9 from the connecting sleeve 8 to remove the bi-telecentric lens 1 from the camera. Remove. This makes it easy to disassemble and use. In a preferred embodiment, the locking member 84 includes two symmetrically arranged groups. The second spring 847 can enhance the locking force of the locking block 843 and cooperate with the first spring 844 to make the locking stronger; at the same time, the second spring 847 generates an upward elastic force on the chuck 846 and can promote the return of the pressing block 842. position, and cooperates with the chuck 846 to prevent the pressure block 842 from moving downward excessively and completely penetrating into the locking groove 93, causing the pressure block 842 to be unable to pop back into place.

Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and embodiments. They can be applied to various fields suitable for the present invention. For those familiar with the art, they can easily Additional modifications may be made, and therefore the invention is not limited to the specific details without departing from the general concept defined by the claims and equivalent scope.

Claims (10)

1. The application method of the optical system for the binocular fatigue degree measuring device is characterized in that the optical system comprises a double telecentric lens, an infrared camera, an infrared illumination light source, a laser-stimulating and flash light fusion frequency integration module, a reflecting mirror and a dichroic mirror;

the surface of the stimulation laser and flash fusion frequency integrated module is provided with a stimulation area light source, and the center of the stimulation area light source is provided with a bright point light source;

the laser-light and the bright point light emitted by the laser-light and flash light fusion frequency integration module reach the dichroic mirror after being reflected by the reflecting mirror, then reflected to human eyes by the dichroic mirror; the reflected light of human eyes and the illumination light emitted by the infrared illumination light source transmit the dichroic mirror and then reach the infrared camera after passing through the double telecentric lens;

the use method of the optical system comprises the following steps:

firstly, a bright point light source of a laser-stimulating and flash light fusion frequency integrated module is turned on and set to be normally bright, an image of the bright point light source is reflected by a reflecting mirror and a dichroic mirror, an observation visual target is provided for human eyes, and the stability of the human eyes during measurement is maintained;

then, simultaneously turning on an infrared illumination light source to illuminate human eyes, wherein an image of the human eyes reaches an infrared camera through a dichroic mirror and a double telecentric lens, and after the image of the human eyes is kept stable, turning on a stimulating area light source of a laser-flash fusion frequency integrated module to finish optical stimulation of the human eyes;

then calculating the reflection time of a pupil Kong Duiguang by a software system in the device, setting a stimulus area light source of the laser-stimulating and flash fusion frequency integrated module to be normally bright when the critical flash fusion frequency is measured, and measuring the critical flash fusion frequency of human eyes by adjusting the flash frequency of the bright spots; and judging the fatigue state of the human body through the measurement of the pupil light reflection time and the comprehensive measurement of the critical flash fusion frequency.

2. The method of using an optical system for a binocular fatigue measuring apparatus according to claim 1, wherein in the optical system, the double telecentric lens includes two for imaging the left and right eyes respectively, and the infrared camera includes two detachably connected to the double telecentric lens.

3. The method of using an optical system for a binocular fatigue measuring device according to claim 2, wherein in the optical system, one end of the double telecentric lens is provided with a connection sleeve, and one end of the camera is provided with a connection cannula; the connecting cannula is used for being matched and inserted into the connecting cannula so as to realize the detachable connection of the double telecentric lens and the camera.

4. The method of claim 3, wherein in the optical system, a positioning plug is disposed on an end face of the connecting cannula, the other end of the positioning plug has an arc end face, a positioning block is disposed on an inner wall of the connecting cannula, and a positioning hole for the positioning plug to be inserted in a matching manner is formed in the positioning block.

5. The method of claim 4, wherein in the optical system, an arc spring is disposed on an inner wall of the positioning hole, and an arc groove for accommodating the arc spring is disposed on an outer wall of the positioning post.

6. The method of using an optical system for a binocular fatigue measuring apparatus according to claim 5, wherein in the optical system, the positioning holes are rectangular holes, and the arc-shaped elastic pieces are provided on both opposite inner walls thereof; the positioning inserting column is a rectangular column body, and the arc-shaped grooves are formed in the two opposite outer walls of the positioning inserting column.

7. The method of using an optical system for a binocular fatigue measuring apparatus according to claim 5, wherein in the optical system, a mounting groove is formed on an inner wall of the connecting sleeve, and a locking member is disposed in the mounting groove;

the locking piece comprises a support column connected with the inner wall of the mounting groove, a transverse plate rotatably connected to the support column, a pressing block connected to one end of the transverse plate, a locking block connected to the other end of the transverse plate and a first spring connected between the locking block and the inner wall of the mounting groove.

8. The method of claim 7, wherein the outer wall of the connecting sleeve is provided with an opening penetrating the mounting groove and allowing the pressing block to protrude.

9. The method of using an optical system for a binocular fatigue measuring apparatus according to claim 8, wherein in the optical system, the upper end of the pressing block is further connected with a chuck, and a second spring is connected between the chuck and the outer wall of the connecting sleeve.

10. The method of claim 9, wherein the outer wall of the connecting cannula is further provided with a locking groove for the locking block to be inserted.