JPH0694981A - Eye gaze detector - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose is to speed up the process of line-of-sight detection by CCD. A plurality of eyeball tissue illuminating means 211 for illuminating an eyeball 209 of an observer, and a corneal reflection image illuminating means 210 for illuminating an eyeball of an observer darker than the eyeball tissue illuminating means.
Based on the detection means 213 for detecting the corneal reflection image formed by the eyeball tissue illuminating means 211 and the corneal reflection image formed by the corneal reflection image forming means 210, and the position of the corneal reflection image detected by the eyeball tissue illuminating means. And a range limiting means for predicting the position of the corneal reflection image by the corneal reflection image illuminating means and limiting the range detected by the detecting means, and the corneal reflection image illuminating means within the range limited by the range limiting means. A line-of-sight detection device that detects the position of the corneal reflection image by the eye and the direction of the line of sight of the observer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting a line-of-sight direction using a corneal reflection image. In particular, the present invention relates to separately providing a corneal reflection image light source and an eyeball illumination light source to detect the line-of-sight direction.

[0002]

2. Description of the Related Art Conventionally, a visual axis detection method is disclosed in, for example, Japanese Patent Laid-Open No. 61-61
There are various proposals such as 172552, etc., but these line-of-sight detection devices use a surface light receiving element such as CCD to read a two-dimensional image of the observer's eye of an observer looking into the finder and sequentially process the read images. Then, the method of detecting the line-of-sight direction is adopted.

[0003]

However, in order to observe the observer's eye of the observer looking through the finder with sufficient accuracy, it is necessary to use a CCD having a large number of pixels. In this case, the CCD sequentially provides image information for each row of light receiving elements, so that the processing speed becomes slow in proportion to the number of pixels. On the other hand, if a CCD with a small number of pixels is used, the processing speed is high, but the detection accuracy is low. Therefore, an object of the present invention is to detect a line of sight accurately and quickly by using a CCD having a large number of pixels.

[0004]

In order to achieve the above-mentioned object, the visual axis detection device of the present invention has a plurality of eyeball tissue illuminating means 211 for illuminating an eyeball 209 of an observer, and observes darker than the eyeball tissue illuminating means. A corneal reflection image illuminating means 210 for illuminating an eyeball of a person, and a detecting means 213 for detecting the corneal reflection image formed by the eye tissue illuminating means 211 and the corneal reflection image formed by the corneal reflection image forming means 210. Predicting the position of the corneal reflection image by the corneal reflection image illuminating means based on the position of the corneal reflection image detected by the eye tissue illuminating means, and a range limiting means for limiting the range detected by the detecting means, and a range It is characterized in that the position of the corneal reflection image by the corneal reflection image illumination means is detected within the range limited by the limiting means to detect the line-of-sight direction of the observer.

[0005]

In the present invention, since the range in which the image information is read and the image information is processed is narrowed, the CC having a large number of pixels is used.
Even if D is used, it is possible to perform a precise and quick line-of-sight detection.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of a camera having a line-of-sight detection device according to the present invention, which includes a photographing lens 201 including a plurality of lenses, a quick return mirror 202, a display device 203, a focusing screen 204, a condenser lens 205, a pentaprism 206, and a plurality of lenses. The optical system is composed of an eyepiece lens 207 which may be a lens of No. 1 and an eyepiece glass 208 which does not have a degree of preventing dust and water droplets from entering the inside from the eyepiece. Further, the eyepiece lens 207 has a dichroic mirror 207a as a light splitting device.

The light emitted from the Purkinje first image forming light source 210 arranged for the purpose of generating the Purkinje first image is reflected by the dichroic mirror 207a and illuminates the observer's eye 209. Two or more light sources 211 for illuminating the eye tissue are arranged for the purpose of directly illuminating the observer eye 209 from the periphery of the eyepiece glass 208 at a position where the observer eye 209 is directly illuminated from the periphery of the eyepiece glass 208. As the two types of light sources, the Purkinje first image forming light source 210 and the eye tissue illuminating light source 211, use a light source that emits light in a wavelength range invisible to the eyes like an infrared light emitting diode. Is desirable. The light emission output of the Purkinje first image forming light source 210 is made smaller than the light emission output of the eye tissue illuminating light source 211. This is because it is possible to determine from which light source the Purkinje first image is output. Further, it is desirable that both light sources be capable of adjusting the amount of emitted light.

The image forming lens 212 forms an image on the photoelectric conversion element 213 which receives the Purkinje first image. Here, the imaging lens 212 uses a tilting optical system, and
A surface light receiving element such as a CCD is suitable for the photoelectric conversion element 213. In this embodiment, a CCD having a large number of pixels is particularly suitable. Further, the output of the CCD may be sequentially read out and processed by a CPU (not shown), or may be temporarily stored in a memory.

FIG. 2 shows the viewfinder portion of the camera in the first embodiment. There are four eyeball tissue illumination light sources 211, and 211a to 211d are viewfinder eyepiece windows 2.
20 are arranged in the lateral direction. In FIG. 2, the four lights are arranged at almost equal intervals (squares), and the angle of illuminating the eyeball when the camera is held in the vertical position is the same as the angle of illuminating the eyeball when the camera is held in the horizontal position. It is located in. That is, they are arranged above and below the finder eyepiece window 220 slightly from the left and right ends of the finder eyepiece window 220.

The four positions of the Purkinje first image by the eyeball tissue illuminating light source 211 and the position of the Purkinje first image by the Purkinje first image forming light source 210 are the eyes 20 of the photographer.
It also differs slightly depending on the position of 9. Therefore, it is best to arrange the four lights at substantially equal intervals, but the photographer's eye 209 is within the range of four positions of the Purkinje first image by the eyeball tissue illumination light source 211. It may be rectangular as long as it contains the first image of Purkinje.

The viewfinder main body 222 has a viewfinder eyepiece window 220, an eyepiece eyepiece 221 for protecting an observer's eyes, a clip-on type accessory shoe 223 attached to an external flash device (not shown), and an unillustrated one. And an eyepiece shutter lever 224 for activating the eyepiece shutter. In this figure, four light sources for illuminating the eyeball tissue are arranged substantially to the left and right of the viewfinder eyepiece window 220, but any number of light sources may be used as long as it can illuminate the eyeball with a sufficient amount of light. Also, the position may be any position as long as it can illuminate the eyeball with a sufficient amount of light substantially on the left and right of the viewfinder eyepiece window 220.

Here, the positional relationship between the eyeball tissue illuminating light source 211a, the eyepiece glass 208 and the eyepiece eyepiece 221 is as shown in FIG. The eyepiece glass 220 is attached to the eyepiece window 220 of the finder body 222, and the eyepiece eyepiece 221 has a structure having no optical system.
It is arranged that 11a does not illuminate the eyepiece glass 220. This is because if there is glass or the like, stray light or ghost may occur due to the reflected light on the surface of the glass, which is not preferable for accurately confirming the Purkinje image. Note that, in FIG. 3, the eyeball tissue illuminating light source 211a, the imaging lens 212, and the photoelectric conversion element 213 are illustrated on the same vertical cross section for the sake of clarity.

FIG. 4 shows an observer's eye 209 of an observer who actually looks through the viewfinder and observes the visual field in the illumination device shown in FIG.
FIG. 6 is a diagram showing a state when viewed from the finder side. The Purkinje first image 260 is obtained by the above-mentioned Purkinje first image forming light source 210, and is the Purkinje first image 26.
1a is due to the eyeball tissue illuminating light source 211a in FIG. 1, and the Purkinje first images 261b, 261c and 261d are also the eyeball tissue illuminating light sources 211b, 211.
c and 211d. Further, 262 is a pupil part of the observer eye 209, 263 is an iris part of the observer eye 209, and 264 is a sclera part of the observer eye 209. The solid lines of the AA ′ portion, the BB ′ portion, and the CC ′ portion are shown to explain FIG. 5 described later, and are not actually displayed.

FIG. 5A shows an output example from the photoelectric conversion element 213 in the AA 'portion in FIG. 4, and FIGS. 5B and 5C similarly show the BB' portion and the CC portion. It is an output example of the photoelectric conversion element 213 of the'section. Lines S1 and S2 are threshold values for determining the output of the photoelectric conversion element 213. In FIG. 5A, the Purkinje first
The output 270 of the Purkinje first image 260 from the image forming light source 210 is strongly output. The output of the Purkinje first image forming light source 210 is adjusted so as to fall within the threshold values of the S1 line and the S2 line. Further, due to scattered light from the eyeball tissue illuminating light source 211 or the like, the output 272 of the pupil portion 262 having a low reflectance and the iris portion 263 having a slightly high reflectance.
Output 273 and output 2 of the sclera 264 with high reflectance
74 is output.

In FIG. 5B, the Purkinje first
The output 270 of the image 260 is not output, but the output 273 of the iris portion 263 and the output 274 of the sclera portion 264 are output. In FIG. 5C, the output 270 of the Purkinje first image 260 is not output, and the eye tissue illumination light sources 211c, 2
The Purkinje first image 261c and the outputs 271c and 271d of the Purkinje first image 261d by 11d are output. In addition, Purkinje first image output 271c and 271d
Is different from the Purkinje first image 270 of FIG. 5A because the illuminance of the Purkinje first images 261c and 261d is strong.
It is out of the light receiving range of the photoelectric conversion element 213.
The output of the eye tissue illuminating light source 211 is adjusted so that the output 274 of the sclera 264 does not exceed the threshold of the S1 line and the output of the Purkinje first image 261 exceeds the threshold of the S2 line. Has been done. Purkinje first statue 2
Since the output of 61 is large, it is easy to detect the position of the Purkinje's first image 260. Also, since the output of Purkinje's first image 260 is small, the position of the Purkinje's first image 260 can be accurately determined.

The Purkinje first image forming light source 210
Also, even if the amount of light emitted from the eyeball tissue illuminating light source 211 cannot be adjusted, the threshold value may be changed. Next, the description of obtaining the line-of-sight direction will be given using the flowchart of FIG. In step # 11, the photoelectric conversion element 21
By detecting the output of No. 3 in the main direction (x) from the starting point shown in FIG. 7 and then detecting the sub direction (y), the position X (x, y) of the output P satisfying S2 ≦ P <S1 is obtained. . Step # 12
Then, the boundary positions D11 and D12 between the pupil portion and the iris portion are obtained. In step # 13, D = (D11 + D12) / 2
Is calculated, and the line-of-sight direction is calculated at the position X and the position D (step # 14). The line-of-sight direction can be detected in this way because the output of the Purkinje first image forming light source 210 is set lower than the output 211 of the eyeball tissue illuminating light source. In the case of this flowchart, if the Purkinje first image 260 is in the center, it means that at least half of the photoelectric conversion elements 213 have been processed.

Although the observer's line-of-sight direction can be obtained by the procedure shown in FIG. 6, the Purkinje first image forming light source 210 and the eyeball tissue illuminating light source 211 are separately provided, so that the following procedure is also possible. It is also possible to obtain the gaze direction. In the embodiment, the Purkinje first image 260 generated by the Purkinje first image forming light source 210 is the same as the eye tissue illuminating light sources 211a (c) arranged on the left and right sides of the Purkinje first image forming light source 210 as a boundary. Light source 211b (d) for eye tissue illumination
Purkinje first image 261a (c) and 211b by
An image is formed between (d). By using this positional relationship, the Purkinje first image 261 can be used rather than the Purkinje first image 260.
If a (c) and 211b (d) are detected first,
The detection time can be shortened by narrowing the range in which the Purkinje first image 260 is detected in advance. This method is shown below. Further, in reality, there may be a case where the Purkinje first image 261 of the eyeball tissue illuminating light source 211 does not form due to the eyelashes of the observer, so that the Purkinje first image 261 of the eyeball tissue illuminating light source 211 is formed. When no image is formed, a method of narrowing the detection range of the Purkinje first image 260 by the Purkinje first image forming light source 210 is also used with reference to the pupil center position.

FIG. 7A shows a light source 211 for illuminating an eyeball tissue.
FIG. 6 is a diagram showing a range in which the Purkinje first image 260 is detected when all Purkinje first images 261 of FIG. The part not covered by the diagonal lines in FIG. 7A is the range in which the Purkinje first image 260 is detected. Photoelectric conversion element 2
13 sequentially detects the output from the left end of the bottom row, and when detecting the Purkinje first images 261c and 261d, the upper detection range is inside the Purkinje first images 261c and 261d. That is, the shaded portions B and C are excluded from the detection range. Therefore, the Purkinje first image 26 shown in FIG.
The calculation speed is faster than that of the 0 detection method.

FIGS. 7B and 7C are diagrams in which one of the Purkinje first images 261 of the eyeball tissue illumination light source 211 is not imaged. The Purkinje first image 216c is shown in FIG. 7B, and the Purkinje first image 2 is shown in FIG. 7C.
16d is not imaged. In this case, when the center of the pupil is clearly detected, the region B or C where the Purkinje first image is not detected is determined. That is, by determining whether the Purkinje first image 216 is on the right side or the left side of the center of the pupil, the detected Purkinje first image 21 is detected.
It is determined whether 6 is the Purkinje first image 216c or the Purkinje first image 216d.

FIG. 8 is a flowchart for obtaining the line-of-sight direction in the procedure described in FIG. In the following description, the output of the first Purkinje first image detected will be called P1, the output of the Purkinje first image detected the second time will be called P2, and the output of the Purkinje first image detected the third time will be called P3. . Step #
At 21, the position X1 at which S2 ≦ P1 is detected from the starting point of the photoelectric conversion element 213 in order to detect the Purkinje first image. In step # 22, it is determined whether or not S1 ≦ P1. If S1 ≦ P1, it is the Purkinje first image 261 by the eyeball tissue illumination light source 211, so step # 23.
If S1 ≦ P1 is not satisfied, it is the Purkinje first image 260 by the Purkinje first image forming light source 210. Therefore, in step # 24, X1 → X3 is replaced and step # 34 is executed.
Proceed to.

In step # 25, in order to detect another Purkinje's first image, S2 ≦ from the starting point of the photoelectric conversion element 213.
The position X2 that is P2 is detected. Light source 2 for eye tissue illumination
Since 11 is arranged in a square, another Purkinje first image 261 should be seen in the same column as the column having the output of P1 or a column near the column. Therefore, another Purkinje first image 261 is detected within a predetermined range. If another Purkinje first image with S2 ≦ P2 is detected, the process proceeds to step # 25, and if not, the process proceeds to step # 28.

In step # 25, it is determined whether or not S1≤P2. If S1 ≦ P2, the Purkinje first image 261 by the eyeball tissue illuminating light source 211 is obtained, so the process proceeds to step # 27. If S1 ≦ P2 is not satisfied, the Purkinje first image 261 is acquired.
Since it is the Purkinje first image 260 by the image forming light source 210, X2 → X3 is replaced in step # 26, and the process proceeds to step # 34.

In step # 27, the output of the photoelectric conversion element 213 is detected within the range of X1 <x <X2. In steps # 28 to # 32, it is determined whether the detected Purkinje first image 261 is on the right side or the left side of the center of the pupil portion. That is, in step # 28, the boundary positions D11 and D12 between the pupil portion and the iris portion are obtained. Step # 2
At 9, D1 = (D11 + D12) / 2 is calculated. The position D1 may be a rough value. In step # 30, it is determined whether X1 ≦ D1 is the position X1 of the first Purkinje image 261 is on the right side or the left side. If X1 ≦ D1, in step # 31, the output of the photoelectric conversion element 213 is detected as X1 ≦ D1.
If x1 ≦ X4 is not satisfied, the output of the photoelectric conversion element 213 is detected at x ≦ X1 in step # 32.

At step # 33, the position X3 where S2≤P3 <S1 is detected within the range defined by any of step # 27, step # 31 or step # 32. At step # 34, the boundary position D2 between the pupil part and the iris part
1 and D22, and in step # 33, D2 = (D2
Calculate 1 + D22) / 2. In step # 36, the line-of-sight direction is obtained from the position X3 and the position D2.

In consideration of the case where the sizes of the positions X1 and X2 obtained in steps # 21 and # 23 are reversed, the step of comparing the sizes of the positions X1 and X2 is performed before step # 27. May be added. If the arrangement of the light source for eye tissue illumination is arranged as shown in FIG. 9, the positional relationship between the Purkinje first images does not change in the entire area of the finder eyepiece window 220, and the line-of-sight direction is detected in the entire area of the finder eyepiece window 220. it can. In FIG. 9, 211e to 211
j is a light source for illuminating the eye tissue. Here, as for the number of light sources for illuminating the eyeball tissue, it is sufficient to illuminate the eyeball with sufficient illuminance as described above. Further, the same components as those described in FIG. 2 are given the same numbers. Next, as a second embodiment according to the present invention, an embodiment in which a rod-shaped light source is used as a light source for illuminating eye tissue will be described. If the rod-shaped eye tissue illumination light source is used, the Purkinje first image by the eye tissue illumination light source is detected in many element rows on the photoelectric conversion element. Therefore, the detection range of the photoelectric conversion element 213 can be narrowed within the range in which the Purkinje first image 260 is present in advance, and thus the processing time can be further shortened.

The situation is shown in FIG. In FIG. 10, Purkinje first images 361L and 361r by the eyeball tissue illuminating light sources 311L and 311r are formed as rods on the cornea. The same parts as those described in FIG. 4 are designated by the same reference numerals. In addition, the solid lines of the DD ′ portion and the EE ′ portion are not actually displayed. If the output from the photoelectric conversion element 213 sandwiched between the solid lines of the DD ′ section and the EE ′ section is confirmed, no matter which row of the photoelectric conversion elements 213 is taken, the Purkinje light source for the eye tissue illumination light source 311 can be used. The first image 361 is detected.

FIG. 11 is a block diagram of a camera having a line-of-sight detection device according to the second embodiment. The eye tissue illumination light source 311 directly illuminates the observer eye 209. Further, two eyeball tissue illuminating light sources 311 are provided (311L, 311) so as to make the observer eyes 209 from the left and right of the eyepiece glass 208.
r) Yes. As the Purkinje first image forming light source 210 and the eyeball tissue illuminating light source 311, it is desirable to use a light source that emits light in a wavelength range invisible to the eyes, such as an infrared light emitting diode.

The eyepiece glass 220 is attached to the eyepiece window 220 of the finder body 222, and the eyepiece eyepiece 2 is attached.
Reference numeral 21 has a structure having no optical system so that the light sources 311L and 311r do not illuminate the eyepiece glass 220. Further, the same components as those described in FIG. 1 are designated by the same reference numerals. FIG. 12 shows a finder portion of a camera in the second embodiment, and rod-shaped eyeball tissue illuminating light sources 311L and 311r are arranged one on each side. The same parts as those described in FIG. 2 are designated by the same reference numerals. FIG. 13 is a flowchart showing the second embodiment. In step # 41, a predetermined row near the center is read from the output of the photoelectric conversion element 213 temporarily stored in the memory. That is, unlike the above two flowcharts, the starting point is not the lower left corner but the middle left corner. This line is read to obtain the boundary positions D11 and D12 between the pupil part and the iris part, and in step # 42, D = (D
Calculate 11 + D12) / 2.

Further, since the eyeball tissue illumination light source 311 is rod-shaped, the Purkinje first image is always detected. Therefore, in step # 43, the position X where S2 ≦ P1 and S2 ≦ P2
Calculate 1 and X2. In addition, the Purkinje first image 26 by the Purkinje first image forming light source 210 is arranged in the read row.
Since 0 may have been detected, three outputs exceeding S2 may occur.

At step # 44, it is determined whether or not S2≤P3 <S1 is detected. If detected, the Purkinje first image 260 by the Purkinje first image forming light source 210
Therefore, the process proceeds to step # 45 to obtain the position X3. If not detected, the process proceeds to step # 46. In step # 46, between the peaks of the outputs of the two Purkinje first images 361 by the eye tissue illumination light source 311, that is, X1 <x.
<X2 is changed to a new Purkinje first image detection range. The row of photoelectric conversion elements is read from the lower end of this range, and the Purkinje first image 260 is detected. By limiting the detection range in this way, the processing time is shortened. Step # 4
In step 7, a position X3 that satisfies S2 ≦ P3 <S1 is obtained.

In step # 48, the line-of-sight direction is obtained from the position D and the position X3. Next, as a third embodiment according to the present invention, a rod-shaped eye tissue illumination light source 311 is used as an eye tissue illumination light source, and a Purkinje first image forming light source 2 is used.
An example of arranging 10 around the viewfinder eyepiece window will be described. In this case, it is not necessary to provide a dichroic mirror on the eyepiece.

FIG. 14 is a block diagram of a camera having a visual axis detecting device according to the third embodiment. The same parts as those described in FIG. 1 are designated by the same reference numerals. This FIG.
11 is different from FIG. 11 in that the Purkinje first image forming light source 210 for generating the Purkinje first image is arranged on the eyepiece lens and is arranged around the viewfinder eyepiece window.

FIG. 15 shows a viewfinder section of a camera according to the third embodiment, in which a Purkinje first image forming light source 210 is arranged above a viewfinder eyepiece window 220. FIG. 16 is an example in which the Purkinje first image forming light source in FIG. 15 is arranged below the finder eyepiece window and next to the image forming lens. Again, the eyepiece glass 220
It is attached to the eyepiece window 220 of the finder body 222, the eyepiece eyepiece 221 has a structure without any optical system, and the two kinds of light sources 210, 311L and 311r are the eyepiece glass 2
20 is not irradiated.

Also in the third embodiment, the line-of-sight direction can be obtained by the method shown in the flowchart of FIG. FIG. 17 shows a fourth embodiment in which the present visual axis detection device is mounted on a finder having a different shape. In FIG. 17, reference numerals 211e to 211j are light sources for eye tissue illumination, 212
Is an imaging lens, 220 is a viewfinder eyepiece window, 223 is a clip-on type accessory shoe, and 226 is FIG.
In the member corresponding to the eyepiece in, referred to as the eyepiece frame,
227 is a camera body, 228 is a pop-up type flash device with built-in camera body, and 229 is a pop-up button of the flash device. The camera shown in FIG.
Has a structure to be fixed to the camera body 227, so that the Purkinje first image forming light source and the eye tissue illuminating light source can be directly arranged on the eyepiece frame 226, and the positions to be arranged are relatively large. Since you can choose, the degree of freedom in design increases. FIG. 18 shows a case in which rod-shaped eye tissue illumination light sources 311L and 311r are arranged, and FIG. 19 shows a rod-shaped eye tissue illumination light sources 311L and 311r and Purkinje first.
This is an example in which an image forming light source 210 is arranged.

[0035]

As described above in detail, according to the present invention, since the range of processing read image information is narrowed, even if a photoelectric conversion element having a large number of pixels is used, information of a part of pixels is not displayed. Is processed, it is possible to perform a precise and quick line-of-sight detection.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a camera of a first embodiment of the present invention.

FIG. 2 is a detailed view of a finder unit of the camera showing the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of a finder portion of the camera showing the first embodiment of the present invention.

FIG. 4 is a diagram showing a relationship between a state of an observer's eye illuminated by the illumination means of the first embodiment of the present invention and a viewfinder eyepiece window which is an area to be observed using the observation means.

FIG. 5 is a diagram showing an output when the observer's eye illuminated by the illumination means of the first embodiment of the present invention is observed by the observation means.

FIG. 6 is a flowchart showing a conventional general line-of-sight detection method.

FIG. 7 is a diagram showing a range in which the Purkinje's first image-forming light source is used to detect the Purkinje's first image among the information from the observation means of the present invention.

FIG. 8 is a flowchart showing a first embodiment of the present invention.

FIG. 9 is a detailed view of the finder unit of the camera showing another arrangement of the light source for illuminating eye tissue according to the first embodiment of the present invention.

FIG. 10 is a diagram showing the relationship between the state of the observer's eyes illuminated by the illumination means of the second embodiment of the present invention and the viewfinder eyepiece window which is the range to be observed using the observation means.

FIG. 11 is a configuration diagram of a camera of a second embodiment of the present invention.

FIG. 12 is a detailed view of a finder unit of a camera showing a second embodiment of the present invention.

FIG. 13 is a flowchart showing a second embodiment of the present invention.

FIG. 14 is a configuration diagram of a third embodiment of the camera of the present invention.

FIG. 15 is a detailed view of a finder unit of a camera showing a third embodiment of the present invention.

FIG. 16 is a detailed view of the finder unit of the camera showing the arrangement of another Purkinje first image light source in the third embodiment of the present invention.

17 is a diagram showing an example in which a light source for illuminating eye tissue is arranged in a finder portion of a camera having a shape different from that of the finder portion of the camera shown in FIG. 10 in the fourth embodiment of the present invention.

FIG. 18 is a diagram showing an example in which a light source for illuminating eye tissue is arranged in a finder portion of a camera having a shape different from that of the finder portion of the camera shown in FIG. 13 in the fourth embodiment of the present invention.

FIG. 19 is a diagram showing an example in which a light source for illuminating eye tissue is arranged in a finder section of a camera having a shape different from that of the finder section of the camera shown in FIG. 16 in the fourth embodiment of the present invention.

[Explanation of symbols]

 201 Photographing lens 202 Quick return mirror 203 Display device 204 Focus plate 205 Condenser lens 206 Penta prism 207 Eyepiece 208 Eyepiece glass 209 Observer's eye 210 Purkinje 1st imaging light source for first imaging 211 Eye tissue of the first embodiment Illumination light source 212 Imaging lens 213 Photoelectric conversion element 220 Finder eyepiece window 221 Eyepiece eyepiece 222 Finder body 223 Accessory shoe 224 Eyepiece shutter lever 311 Light source for eyeball tissue illumination of the second embodiment

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location G03B 13/02 7139-2K 7316-2K G03B 3/00 A

Claims (6)

[Claims] 1. A plurality of eye tissue illuminating means for illuminating an eyeball of an observer, a corneal reflection image illuminating means for illuminating an eyeball of an observer darker than the eyeball tissue illuminating means, and the eyeball tissue illuminating means. Detection means for detecting the formed corneal reflection image and the corneal reflection image formed by the corneal reflection image forming means; and illumination for the corneal reflection image based on the position of the corneal reflection image detected by the eye tissue illuminating means. Means for predicting the position of the corneal reflection image by the means, and range limiting means for limiting the range detected by the detecting means, and corneal reflection by the corneal reflection image illuminating means within the range limited by the range limiting means. A line-of-sight detection device that detects the position of an image and detects the direction of the line of sight of an observer. 2. A plurality of eyeball tissue illuminating means for illuminating an eyeball of an observer, a corneal reflection image illuminating means for illuminating an eyeball of an observer darker than the eyeball tissue illuminating means, and the eyeball tissue illuminating means. Detecting means for detecting the reflected light of the eyeball illuminated by the corneal reflection image and the corneal reflection image and the corneal reflection image formed by the illumination means for the corneal reflection image and the eyeball tissue illumination means, and detected by the eyeball tissue illumination means A range limiting unit that predicts the position of the corneal reflection image by the corneal reflection image illumination unit based on the position of the corneal reflection image and the position of the reflected light of the eyeball, and limits the range detected by the detection unit. A line-of-sight detection device that detects the position of the corneal reflection image by the corneal reflection image illumination unit within the range limited by the range limiting unit to detect the line-of-sight direction of the observer. 3. The line-of-sight detection device according to claim 1 or 2, wherein the positional relationship between both corneal reflection images formed by illumination of said eyeball tissue illuminating means and said corneal reflection image illuminating means is: A line-of-sight detection device, wherein the eyeball tissue illuminating means and the corneal reflection image illuminating means are arranged so as to have the same relationship regardless of the position of the eyeball of the photographer. 4. The line-of-sight detection device according to claim 1, wherein the eyeball tissue illuminating unit illuminates a peripheral portion of an observer's eyeball, and the corneal reflection image illuminating unit illuminates a central portion of the observer's eyeball. A line-of-sight detection device, which illuminates a subject. 5. The line-of-sight detection device according to claim 1 or 2, wherein the eyeball tissue illuminating unit is rod-shaped. 6. The line-of-sight detection device according to claim 1, wherein the detection means and the plurality of eyeball tissue illumination means are provided in an eyepiece portion of the camera without sharing an optical member with an eyepiece optical system of the camera. A camera having a line-of-sight detection device.