JP2018105954A - Light transmission body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light transmission body which can detect light in a predetermined wavelength band entering the pupils of light entering the eyeballs of user.SOLUTION: A contact lens 1 is a light transmission body arranged in a position in contact with or within 3-cm distance from the eyeballs 100 of a user. The contact lens has a detection unit 10 for detecting light in a predetermined wavelength band, which is formed in the pattern of a lattice in a pupil region 2 overlapping with the pupil 103 of the user in the visual field direction of the user.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a light transmission body.

  In recent years, with the widespread use of LEDs (Light Emitting Diodes), there are more opportunities for blue light called blue light to enter the eyes through lighting in homes and offices, LCD screens of televisions, personal computers (PCs), and smartphones. ing. Blue light is light having a wavelength range of 380 to 500 nm, has the shortest wavelength among visible light, has strong energy, and reaches the retina without being absorbed by the cornea or the crystalline lens when entering the eye. Therefore, if blue light enters the eye for a long time, it not only affects eyestrain, pain, sleep disorders, etc., but also damages the retina and macular region, which may increase the risk of developing macular degeneration. It has been pointed out.

  There has been proposed a contact lens in which a contact lens used as a visual correction device directly attached to an eyeball is added with a function of detecting light such as incident ultraviolet light and adjusting the amount of transmitted light (for example, patent document). 1). The contact lens described in Patent Document 1 has an eyeball according to the amount of light such as ultraviolet light detected based on an image captured by an imaging unit (see FIG. 1 of Patent Document 1) provided at the peripheral edge of the contact lens. The amount and wavelength of light transmitted through at least one of the first region covering the pupil of the first and the second region covering the iris outside thereof are adjusted. According to such a configuration, it is considered possible to detect the amount of blue light based on the image captured by the imaging unit.

WO2014 / 178221

  However, in the contact lens described in Patent Document 1, the imaging unit has a lens system, a drive system, and an individual imaging element array, and is provided outside the first region that covers the pupil. Therefore, light that can be detected among the light incident on the eyeball is light that is incident on a narrow area outside the pupil, and there is a problem that it is not possible to detect light that may enter the pupil and affect the retina. In addition, for example, when the imaging unit is covered with a heel in a thin state where the user slightly opens the heel, there is a problem that light incident on the eyeball cannot be detected.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  [Application Example 1] The light transmissive body of the present application example is a light transmissive body that is placed in contact with or at a distance of 3 cm or less with respect to the user's eyeball. It is characterized by having a detection unit configured to detect light in a predetermined wavelength range, which is configured in a lattice shape in a pupil region overlapping with the pupil.

  According to the configuration of the light transmitting body of this application example, since the detection unit configured in a lattice shape is arranged in a pupil region that overlaps the user's pupil in the user's visual field direction, the detection unit enters the user's eyeball. Light in a predetermined wavelength range incident on the pupil can be detected. Moreover, even if a part of the outside of the pupil region is covered with eyelids such as in a thin state, light incident on the eyeball (pupil) can be detected. In addition, since the detection unit is configured in a lattice shape, even if the detection unit is arranged in the pupil region, light is transmitted between the lattices and enters the pupil. You can see things. Further, if the detection unit is arranged to extend outside the pupil region, it is possible to detect light incident on a wider range in the eyeball.

  Application Example 2 In the light transmitting body according to the application example described above, it is preferable that an aperture ratio of an aperture that transmits light in the detection unit is 30% or more with respect to the pupil region.

  According to this configuration, even if the detection unit is arranged in the pupil region, 30% or more of the light is transmitted, so that the visibility of the user is maintained.

  Application Example 3 In the light transmission body according to the application example described above, it is preferable that a film that reduces the transmittance of light in the predetermined wavelength region is disposed in the opening.

  According to this configuration, the transmittance of light in a predetermined wavelength region of light incident on the opening is reduced by the film disposed in the opening, so that the light in the predetermined wavelength region incident on the pupil of the user is reduced. The amount of light can be reduced.

  Application Example 4 It is preferable that the light transmission body according to the application example described above further includes a communication unit that transmits a detection signal of the detection unit to the outside.

  According to this configuration, by transmitting the detection signal of the detection unit to an external device such as a smartphone or a personal computer by the communication unit, it is possible to monitor and analyze light incident on the user's eyeball. .

  Application Example 5 In the light transmission body according to the application example described above, it is preferable that the light in the predetermined wavelength range is blue light, and the detection unit can detect the light amount of the blue light.

  According to this configuration, it is possible to detect blue light incident on the user's eyeball.

  Application Example 6 The light transmission body according to the application example described above, wherein the light transmission body may be a contact lens.

  According to this configuration, the light transmitting body can be provided in the form of a contact lens.

  Application Example 7 The light transmission body according to the application example described above, wherein the light transmission body may be a spectacle lens.

  According to this configuration, the light transmitting body can be provided in the form of a spectacle lens.

The schematic diagram which shows schematic structure of the contact lens which concerns on this embodiment. 1 is a cross-sectional view illustrating a schematic configuration of a contact lens according to an embodiment. The front view which shows schematic structure of the contact lens which concerns on this embodiment. 1 is a block diagram showing a schematic configuration of a contact lens according to an embodiment. The figure explaining an example of the manufacturing method of the contact lens which concerns on this embodiment. The top view which shows the example of arrangement | positioning of the detection part which concerns on this embodiment. The top view which shows the example of arrangement | positioning of the detection part which concerns on this embodiment. The front view which shows schematic structure of the lens for spectacles which concerns on a modification.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings. The embodiments described below do not unduly limit the contents of the present invention described in the claims. In addition, all the configurations described in the embodiments are not necessarily essential configuration requirements of the invention.

<Configuration of light transmitting body>
First, a configuration of a contact lens as a light transmitting body according to the present embodiment will be described with reference to FIGS. 1, 2, 3, and 4. FIG. 1 is a schematic diagram illustrating a schematic configuration of a contact lens according to the present embodiment. FIG. 2 is a cross-sectional view illustrating a schematic configuration of the contact lens according to the present embodiment. FIG. 3 is a front view showing a schematic configuration of the contact lens according to the present embodiment. FIG. 4 is a block diagram illustrating a schematic configuration of the contact lens according to the present embodiment.

  As shown in FIG. 1, the contact lens 1 according to the present embodiment has a curved surface shape, and is disposed (mounted) and used in contact with a user's eyeball 100. In a state where the contact lens 1 is worn, the light L incident from the visual field direction of the user passes through the contact lens 1 and enters the pupil 103 surrounded by the iris 102 from the cornea 101 and is refracted by the crystalline lens 104. The images are connected by the retina 105. The contact lens 1 has a pupil region 2 that overlaps the user's pupil 103 and a peripheral region 3 that is disposed around the pupil region 2 in the user's visual field direction.

  As shown in FIG. 2, the contact lens 1 includes a first lens layer 1a, a second lens layer 1c, and a flexible substrate 1b sandwiched between the first lens layer 1a and the second lens layer 1c. It is configured. The first lens layer 1a and the second lens layer 1c can be formed of a known material.

  When the contact lens 1 is a hard lens, the first lens layer 1a and the second lens layer 1c are made of, for example, an oxygen permeable (RGP) material or polymethyl methacrylate (PMMA). . When the contact lens 1 is a soft lens, the first lens layer 1a and the second lens layer 1c are, for example, a water-containing material such as polyhydroxyethyl methacrylate (PHEMA), a non-water-containing material such as an acrylic elastomer, or silicone. Consists of highly oxygen permeable materials such as hydrogel. The configuration of the flexible substrate 1b will be described later.

  As shown in FIG. 3, the outer shape of the contact lens 1 is circular. The pupil region 2 is circular, is disposed at the center of the contact lens 1, and is surrounded by the peripheral region 3. As described above, the pupil region 2 is a region that overlaps the user's pupil 103 (see FIG. 1) in the user's visual field direction. In the pupil region 2, a detection unit 10 including photodiodes PD arranged in a grid is arranged.

  Here, the size of the pupil 103 shown in FIG. 1 changes as the iris 102 expands or contracts according to the amount of light incident on the eyeball 100. More specifically, when the amount of light incident on the eyeball 100 is large (bright), the iris 102 extends and the diameter of the pupil 103 decreases, and when the amount of light incident on the eyeball 100 is small (dark), the iris 102 expands. 102 contracts and the diameter of the pupil 103 increases. In general, the diameter of the pupil 103 is said to be about 2 mm when it is small and about 8 mm when it is large.

  The size (diameter) of the pupil region 2 shown in FIG. 3 is set to 8 mm or more, which is said to be the maximum diameter of the pupil 103. Therefore, when the user wears the contact lens 1, the light that enters the pupil 103 from the direction of the user's visual field is arranged by the detection unit 10 regardless of the expansion / contraction of the iris 102 (the size of the diameter of the pupil 103). Passes through the pupil region 2 formed. Note that the size (diameter) of the minimum pupil region 2 a indicated by a broken line in FIG. 3 corresponds to 2 mm, which is the minimum diameter of the pupil 103.

  The detection unit 10 detects light in a predetermined wavelength region among light incident on the pupil 103 of the user. The light in the predetermined wavelength range is, for example, blue light called blue light having a wavelength range of 380 nm to 500 nm.

  Blue light has the shortest wavelength among visible light and has strong energy, and when it enters the eyeball 100, it reaches the retina 105 without being absorbed by the cornea 101 or the crystalline lens 104. Therefore, if blue light enters the eye for a long time, it not only affects eyestrain, pain, sleep disorders, etc., but also damages the retina and macular region, which may increase the risk of developing macular degeneration. It has been pointed out.

  In the peripheral area 3, a control unit 20, a communication unit 22, and an antenna 24 are arranged. The control unit 20 controls the operations of the detection unit 10 and the communication unit 22. The control unit 20 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like (not shown). The communication unit 22 wirelessly connects to an external device such as a personal computer (PC) or a smartphone via the antenna 24 and transmits a detection signal detected by the detection unit 10.

  The detection unit 10, the control unit 20, the communication unit 22, and the antenna 24 are provided on the flexible substrate 1b shown in FIG. Although not shown, the contact lens 1 may include a power supply unit such as a solar cell for supplying power to the detection unit 10, the control unit 20, and the communication unit 22. In addition, power may be supplied by an electromagnetic induction method, a radio wave method, an electromagnetic resonance method, or the like via the antenna 24.

<Configuration of detection unit>
Next, the configuration of the detection unit 10 will be described with reference to FIG. FIG. 4 is a perspective view illustrating a schematic configuration of the detection unit according to the present embodiment.

As shown in FIG. 4, the detection unit 10 includes an insulating layer 12, a cathode wiring 14 including a cathode, a photodiode PD, an insulating layer 15, and an anode wiring 17 including an anode. The photodiode PD is composed of an n-type semiconductor layer 13 and a p-type semiconductor layer 16. The n-type semiconductor layer 13 is electrically connected to the cathode (cathode wiring 14). The p-type semiconductor layer 16 is electrically connected to the anode (anode wiring 17). The insulating layer 12 and the insulating layer 15 are made of a light-transmitting insulating material such as SiO ₂ .

  In the region overlapping the photodiode PD on the surface of the detection unit 10 (the surface on which light is incident), blue light having a predetermined wavelength range of 380 nm to 500 nm is transmitted and light other than blue light is transmitted. Is formed. Thereby, when light enters the detection unit 10, the photodiode PD selectively receives blue light in the incident light. Then, the reverse leakage current of the pn junction constituting the photodiode PD changes according to the amount of blue light. The detection unit 10 can detect the amount of blue light based on the amount of change in the reverse leakage current.

  According to the configuration of the contact lens 1 including such a detection unit 10, it is possible to detect blue light incident on the pupil 103 out of light incident on the user's eyeball regardless of the diameter of the pupil 103. Thereby, the light quantity of the blue light incident on the pupil 103 can be calculated, and the light quantity distribution in the pupil area 2 of the blue light can be monitored.

  For example, a threshold value of the amount of blue light is set in advance, and if the amount of blue light incident on the pupil 103 exceeds this threshold, a warning signal is sent to the smartphone or PC by the communication unit 22 to notify the user. Thus, inflammation of the eyeball 100 caused by blue light can be prevented. In addition, it is possible to grasp how much blue light is irradiated in the user's work environment or the like.

  According to the configuration of the contact lens 1, since the detection unit 10 including the photodiode PD is arranged in the pupil region 2, a part of the pupil region 2 and the outer peripheral region 3 outside thereof, such as a thin state, is not visible. Even if it is covered with blue light, blue light incident on the eyeball 100 (pupil 103) can be detected. Since the detection unit 10 is configured in a lattice shape, even if the detection unit 10 is arranged in the pupil region 2, light passes through the lattice and enters the pupil 103. You can see the scenery and objects through.

  In addition to the above-described configuration, a film that reduces or suppresses transmission of blue light may be formed in a region other than the region overlapping the photodiode PD in the detection unit 10. According to such a configuration, blue light out of the light incident on the detection unit 10 is shielded by the photodiode PD, the cathode wiring 14 and the anode wiring 17, and the photodiode PD, the cathode wiring 14 and the anode wiring 17. Transmission in the opening 18 (see FIG. 6) surrounded by is reduced or suppressed. Thereby, since the light quantity of the blue light which injects into the pupil 103 can be reduced, the influence of the blue light on the eyeball 100 such as the retina 105 can be suppressed.

  In this embodiment, the light of a predetermined wavelength range is blue light of 380 nm to 500 nm. However, the light of the predetermined wavelength range may include not only blue light but also ultraviolet light of 380 nm or less, It is good also as limiting to only ultraviolet light. Further, by selectively disposing a reflective film formed in a region overlapping with the photodiode PD, the photodiode PD for detecting blue light and the photodiode PD for detecting ultraviolet light may be mixed and disposed.

<Method for producing light transmitting body>
Next, an example of a method for manufacturing the contact lens 1 will be described with reference to FIGS. FIG. 5 is a diagram for explaining an example of a method for manufacturing a contact lens according to the present embodiment.

  First, a method for forming the detection unit 10 shown in FIG. 4 will be described. The detection unit 10 can be formed using, for example, an SOI (Silicon On Insulator) substrate. Boron (B) or the like is diffused in the n-type semiconductor layer of the SOI substrate in which the substrate 11 made of silicon, the insulating layer 12, and the n-type semiconductor layer are stacked, and the p-type semiconductor layer 16 is formed on the upper layer side. Thereby, a photodiode layer in which the n-type semiconductor layer 13 and the p-type semiconductor layer 16 are stacked is formed.

  Subsequently, in the photodiode layer in which the n-type semiconductor layer 13 and the p-type semiconductor layer 16 are stacked, other than the substantially circular (or mesa-shaped) portion constituting the photodiode PD of the p-type semiconductor layer 16. The portion is etched until it reaches the n-type semiconductor layer 13. The photodiodes PD are arranged in a lattice pattern when viewed from the anode wiring 17 side. Then, a cathode wiring 14 including a cathode corresponding to the position of the photodiode PD on the n-type semiconductor layer 13 and extending along one direction (lateral direction in FIG. 4) of the photodiode PD arranged in a lattice shape. Form.

  Subsequently, the n-type semiconductor layer 13 is etched to form a dividing groove that reaches the insulating layer 12 along the cathode wiring 14 between the cathode wirings 14 in the n-type semiconductor layer 13. Then, the insulating layer 15 is formed so as to cover the insulating layer 12, the n-type semiconductor layer 13, and the cathode wiring 14 and to bury between adjacent photodiodes PD. Then, a portion of the photodiode PD in contact with the p-type semiconductor layer 16 is used as an anode, and an anode wiring 17 extending along a direction (an oblique direction in FIG. 4) intersecting the extending direction of the cathode wiring 14 is formed.

  Subsequently, a reflective film (not shown) that reflects light outside a predetermined wavelength range is formed on the surface of the detection unit 10 (the surface on the side where the anode wiring 17 is formed) using a vapor deposition method or the like, and the reflective film Of these, only the part overlapping with the photodiode PD is left and the other part is removed. A film that suppresses transmission of light in a predetermined wavelength region may be formed in a region other than the region overlapping the photodiode PD in which the reflective film is disposed. Thereby, the detection part 10 is formed. Although not shown, the control unit 20, the communication unit 22, and the antenna 24 are formed on the substrate 11 on which the detection unit 10 is formed, and necessary wiring is provided.

  Subsequently, the detection unit 10 including the substrate 11 formed using the SOI substrate as described above is bonded to the flexible substrate 1b illustrated in FIG. Although not shown, a temporary transfer substrate is bonded to the surface of the detection unit 10 including the substrate 11 (the surface on the side where the anode wiring 17 is formed) using a water-soluble adhesive or the like. And after peeling the board | substrate 11 from the detection part 10 and adhere | attaching the flexible substrate 1b on the side which peeled the board | substrate 11 of the detection part 10, the water-soluble adhesive is melted in water and the board | substrate for temporary transfer is peeled. . Thereby, the flexible substrate 1b on which the detection unit 10 is arranged is obtained.

  Apart from the flexible substrate 1b, the first lens layer 1a and the second lens layer 1c are formed using a known method, for example, a method such as lace cutting, spin casting, molding or the like. The first lens layer 1 a and the second lens layer 1 c are formed to have a desired degree as the contact lens 1. The contact lens 1 is obtained by sandwiching the flexible substrate 1b between the first lens layer 1a and the second lens layer 1c and bonding them together via an adhesive.

  In addition, any one of the detection unit 10, the control unit 20, the communication unit 22, and the antenna 24 is formed on another flexible substrate, and the flexible substrate is provided between the first lens layer 1a and the second lens layer 1c. It is good also as a structure clamped with 1b.

<Arrangement of detector>
Next, the arrangement (planar configuration) of the detection units will be described with reference to FIG. FIG. 6 is a plan view illustrating an arrangement example of the detection units according to the present embodiment. Specifically, FIG. 6 is a partially enlarged view of the detection unit 10 disposed on the flexible substrate 1b as viewed from the front side.

  As shown in FIG. 6, in the pupil region 2, the cathode wiring 14 and the anode wiring 17 are arranged in a lattice pattern, and the photodiode PD is arranged at the intersection of the cathode wiring 14 and the anode wiring 17. The light incident on the pupil region 2 is shielded by the cathode wiring 14, the anode wiring 17, and the photodiode PD, and passes through the opening 18 surrounded by the cathode wiring 14, the anode wiring 17, and the photodiode PD (predetermined) If a film that suppresses transmission of light in the wavelength region is formed, the amount of transmission is reduced).

  Here, as described above, the diameter of the pupil 103 changes according to the amount of light incident on the eyeball 100. Therefore, depending on the amount of incident light, among the photodiodes PD arranged in the pupil region 2, there are photodiodes PD that do not contribute to detection of light incident on the pupil 103. In addition, in a thin state where the user slightly opens the eyelid, part of the light incident on the pupil 103 may be shielded by the eyelid. Therefore, in order to accurately detect the amount of light in a predetermined wavelength region incident on the pupil 103, it is desirable to arrange more photodiodes PD in the minimum pupil region 2a corresponding to the minimum diameter of the pupil 103. .

  However, when the arrangement density of the photodiodes PD is increased, the openings 18 are narrowed, so that the amount of light transmitted through the detection unit 10 is reduced with respect to the amount of incident light, and the user can detect the detection unit 10 ( It becomes difficult to visually recognize the scenery and the object through the contact lens 1). The inventor believes that the aperture ratio of the opening 18 in a predetermined region (for example, the minimum pupil region 2a) in which the detection unit 10 is disposed is 30% or more in order to ensure the visibility of the user. Preferably, 50% or more is considered more preferable.

  Since the contact lens 1 is attached to the eyeball 100, the detection unit 10 is disposed at a position close to the cornea 101. Therefore, when the arrangement density of the photodiodes PD is increased, the user feels that the brightness is lowered, but it is considered that the image connected by the retina 105 is not affected so much and the aperture ratio is about 30%. I think that it is possible to see the scenery and objects.

  In order to increase the aperture density of the openings 18 while increasing the arrangement density of the photodiodes PD, it is required to reduce the diameter of the photodiode PD and the line widths of the cathode wiring 14 and the anode wiring 17. However, if the diameter of the photodiode PD and the line widths of the cathode wiring 14 and the anode wiring 17 are made too small, the electrical characteristics of the detection unit 10 and the manufacturing yield will be reduced.

  Therefore, as the arrangement density of the photodiodes PD, at least nine photodiodes PD are arranged in the minimum pupil region 2a as shown in FIG. Then, the diameter of the photodiode PD and the line widths of the cathode wiring 14 and the anode wiring 17 are set within a range in which the electrical characteristics of the detection unit 10 and the manufacturing yield are not reduced. Below, based on the Example which changed these settings, the aperture ratio of the opening part 18 is estimated and demonstrated.

Example 1
Example 1 shown in FIG. 6 is an example in which nine photodiodes PD are arranged in the minimum pupil region 2a. The diameter of the photodiode PD is 0.2 mm, and the line widths of the cathode wiring 14 and the anode wiring 17 are 0.02 mm. Here, it is assumed that the minimum pupil area 2a is a square 2b inscribed in a circle having a radius of 2 mm, and the aperture ratio is approximated. In addition, the extending direction of the cathode wiring 14 is a row direction, and the extending direction of the anode wiring 17 is a column direction.

One side of the square 2b inscribed in a circle with a radius of 2 mm is 2 / √2 = √2. When the photodiodes PD of 3 rows × 3 columns are arranged in the square 2b, the arrangement pitch of the photodiodes PD in the row direction and the column direction is approximately √2 / 3 = 0.47 mm. Since the area per photodiode PD is 0.04 mm ² , the total area of the nine photodiodes PD arranged in the square 2b is 0.36 mm ² .

Further, the length of one cathode wiring 14 arranged in the square 2b is √2 mm, but since it overlaps with three photodiodes PD per one, a portion of the cathode wiring 14 that does not overlap with the photodiode PD. Is approximately √2− (0.2 × 3) = 0.81 mm. Since the number of the cathode wirings 14 is 3, the total length of the cathode wirings 14 is 0.81 × 3 = 2.43 mm. Therefore, the total area of the cathode wiring 14 is 2.43 mm × 0.02 mm = 0.0486 mm ² . Similarly, the anode wiring 17 is 0.0486 mm ² .

Thus, the total area of the photodiode PD and the cathode wiring 14 and the anode wiring 17 disposed in a square 2b becomes 0.4572Mm ^2, the area of the opening 18 is 2mm ² -0.4572mm ² = 1. 5428 mm ² . As a result, the aperture ratio of the opening 18 is 77.14%. In the first embodiment, 145 photodiodes PD are arranged in the pupil region 2.

(Example 2)
In the second embodiment, although not shown in the drawing, the setting is the same as the configuration of the first embodiment except that the diameter of the photodiode PD is 0.1 mm. In addition, since the thickness (diameter) of the hair is generally said to be 0.05 to 0.15 mm, the diameter of the photodiode PD in Example 2 corresponds to the average thickness of the hair.

In Example 2, the area per one of the photodiode PD is 0.01 mm ^2, the total area of the photodiode PD becomes 0.09 mm ^2. The length of the portion of the cathode wiring 14 and the anode wiring 17 that does not overlap with one photodiode PD is approximately √2− (0.1 × 3) = 1.11 mm. Therefore, the total area of the cathode wiring 14 and the anode wiring 17 is 1.11 mm × 0.02 mm × 3 × 2 = 0.0444 mm ² . As a result, the total area of the photodiode PD arranged in the square 2b, the cathode wiring 14 and the anode wiring 17 is 0.1344 mm ^2, and the aperture ratio of the opening 18 is 93.28%.

(Example 3)
In the third embodiment, although not shown in the drawing, the setting is the same as in the configuration of the second embodiment except that 64 photodiodes PD are arranged in the minimum pupil region 2a (square 2b). That is, photodiodes PD of 8 rows × 8 columns are arranged in the square 2b. The arrangement pitch of the photodiodes PD in the row direction and the column direction is approximately about √2 / 8 = 0.18 mm. Since the area per photodiode PD is 0.01 mm ² , the total area of 64 photodiodes PD arranged in the square 2b is 0.64 mm ² .

The length of the portion of the cathode wiring 14 and the anode wiring 17 that does not overlap with one photodiode PD is approximately √2− (0.1 × 8) = 0.61 mm. Since the number of the cathode wirings 14 and the anode wirings 17 is eight, the total area of the cathode wirings 14 and the anode wirings 17 is 0.61 mm × 0.02 mm × 8 × 2 = 0.19552 mm ² . Therefore, the total area of the photodiode PD, the cathode wiring 14 and the anode wiring 17 arranged in the square 2b is 0.8352 mm ^2, and the opening ratio of the opening 18 is 58.24%.

  As shown in the above embodiment, even if nine photodiodes PD are arranged in the pupil minimum region 2a, the aperture ratio of the opening 18 can be 90% or more. Although the upper limit of the aperture ratio is not particularly defined, an aperture ratio of about 95% can be realized within a range in which the electrical characteristics of the detection unit 10 and the manufacturing yield are not reduced.

  Further, even when the arrangement density of the photodiodes PD is increased, the aperture ratio of the opening 18 can be 50% or more without lowering the electrical characteristics of the detection unit 10 and the manufacturing yield. If the aperture ratio is 30% or more, it is possible to further increase the arrangement density of the photodiodes PD.

  The photodiode PD may be arranged not only in the pupil region 2 but also in the peripheral region 3. In this way, it is possible to detect light incident on a wider range in the eyeball 100.

  In addition to the above-described example, an arrangement example of the detection unit 10 according to the present embodiment is illustrated in FIG. FIG. 7 is a plan view illustrating an arrangement example of the detection units according to the present embodiment.

  In the example shown in FIG. 7, the arrangement pitch of the photodiodes PD is 0.41 mm, and a total of 293 photodiodes PD are arranged in the pupil region 2 in a maximum of 19 rows and 19 columns. In the minimum pupil region 2a, a total of 21 photodiodes PD are arranged in a maximum of 5 rows and 5 columns.

  The above-described embodiments merely show one aspect of the present invention, and can be arbitrarily modified and applied within the scope of the present invention. As modifications, for example, the following can be considered.

  In the above embodiment, the configuration of the contact lens is described as the light transmitting body, but the present invention is not limited to such a form. For example, the light transmissive body may be a spectacle lens. FIG. 8 is a front view showing a schematic configuration of a spectacle lens according to a modification.

  As shown in FIG. 8, the spectacle lens 1 </ b> A is provided with a detection unit 10 </ b> A including photodiodes PD, cathode wirings 14, and anode wirings 17 arranged in a lattice pattern. In the case of the spectacle lens 1 </ b> A, the eyeglass lens 1 </ b> A is positioned away from the user's eyeball 100 and is disposed at a distance of 3 cm or less with respect to the eyeball 100. When the light transmitting body of the present invention is disposed in a range exceeding 3 cm with respect to the eyeball 100, it becomes difficult to ensure the visibility of the user. In addition, it is desirable that the detection unit 10A is arranged in a wide range in the spectacle lens 1A so as to cope with a change in the viewing direction of the user according to the distance from the eyeball 100.

  For example, in the spectacle lens 1A shown in FIG. 8, it is assumed that the photodiode PD is arranged in a region having a length of 40 mm in the horizontal direction (row direction) and a length of 24 mm in the vertical direction (column direction). If the arrangement pitch of the photodiodes PD in the row direction and the column direction is 0.4 mm, 100 × 60 = 6000 photodiodes PD can be arranged in this region. A control unit 20, a communication unit 22, and an antenna 24 are arranged around the area where the photodiode PD is arranged.

  The light transmissive body according to the present embodiment may be a head mounted display (HMD) that is mounted on the user's head and displays an image (virtual image). Furthermore, it is good also as a structure which arrange | positions the detection part 10 to the protective film of the display of a smart phone or a tablet terminal as an application example of the light transmissive body based on this embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Contact lens (light transmissive body), 1A ... Lens for glasses (light transmissive body), 2 ... Pupil area | region, 10 ... Detection part, 18 ... Opening part, 22 ... Communication part, 100 ... Eyeball, 103 ... Pupil.

Claims (7)

A light transmissive body placed in contact with the user's eyeball or at a distance of 3 cm or less,
A light transmissive body comprising: a detection unit configured to detect light in a predetermined wavelength region, which is configured in a lattice shape in a pupil region overlapping with a pupil of the user in the visual field direction of the user.   The light transmission body according to claim 1, wherein an aperture ratio of an aperture that transmits light in the detection unit to the pupil region is 30% or more.   The light transmitting body according to claim 2, wherein a film that reduces the transmittance of light in the predetermined wavelength region is disposed in the opening.   The light transmission body according to any one of claims 1 to 3, further comprising a communication unit that transmits a detection signal of the detection unit to the outside. The light in the predetermined wavelength range is blue light,
The light transmission body according to claim 1, wherein the detection unit is capable of detecting a light amount of the blue light.   The light transmissive body according to claim 1, wherein the light transmissive body is a contact lens.   The light transmissive body according to claim 1, wherein the light transmissive body is a lens for spectacles.

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