Optical biometric device

Abstract

An optical biometric device includes a light source, a first-order coupler, first and second second-order couplers, first and second optical path difference generators, first and second optical element sets, and first and second detectors. The first-order coupler receives incident light from the light source and emits first and second first-order lights. The first second-order coupler receives the first first-order light and emits first and second second-order lights. The second second-order coupler receives the second first-order light and emits third and fourth second-order lights. The first / second optical path difference generator generates the first / fourth second-order light with a first / second optical path difference. The first / second optical element set directs the second / third second-order light to a first / second location of an eye and receives first / second reflected lights. The first / second detector receives a first / second detection signal.

Description

Technical Field

[0001] This invention relates to biometrics, and more particularly to an optical biometric device. Background Technology

[0002] like Figure 1 As shown, when the traditional optical biometer 1 is used to detect eye eye, its optical sensing module SEN needs to measure different positions / interfaces of the eye eye (such as cornea, anterior to the lens, posterior to the lens, and retina) at different times. For eye eye eyes with longer axial lengths, this takes a long time, resulting in a longer overall detection time and the inability to simultaneously detect different positions / interfaces of the eye eye. Further improvements are needed. Summary of the Invention

[0003] In view of this, the present invention proposes an optical biometer to solve the above-mentioned problems encountered by the prior art.

[0004] According to a specific embodiment of the present invention, an optical biometer is provided. In this embodiment, the optical biometer includes: a light source for emitting incident light; a primary coupler for receiving the incident light and emitting a first primary light and a second primary light respectively; a first secondary coupler for receiving the first primary light and emitting a first secondary light and a second secondary light respectively; a second secondary coupler for receiving the second primary light and emitting a third secondary light and a fourth secondary light respectively; a first optical path difference generator for receiving the first secondary light and emitting a first secondary light with a first optical path difference to the first secondary coupler; and a second optical path difference generator for receiving the fourth secondary light and emitting a fourth secondary light with a second optical path difference to the second secondary coupler. The device includes: a first optical element group for directing second-order light to a first position / interface of the eye and directing first reflected light from the first position / interface to a first-order coupler; a second optical element group for directing third-order light to a second position / interface of the eye and directing second reflected light from the second position / interface to a second-order coupler; a first detector for receiving a first detection signal generated by the first-order coupler based on the first-order light and the first reflected light having a first optical path difference; and a second detector for receiving a second detection signal generated by the second-order coupler based on the fourth-order light and the second reflected light having a second optical path difference.

[0005] In one embodiment, the first location / interface is the retina and the first detection signal is related to the retina.

[0006] In one embodiment, the second location / interface is the cornea and the second detection signal is related to the cornea.

[0007] In one embodiment, the first optical path difference generator includes a first lens and a first reflector. The first-order light emitted by the first first-order coupler passes through the first lens and is reflected by the first reflector, then passes through the first lens and is sent back to the first first-order coupler. The first reflector moves in the horizontal direction to generate a first optical path difference in the first-order light.

[0008] In one embodiment, the second optical path difference generator includes a second lens and a second reflector. The fourth-order light emitted from the second-order coupler passes through the second lens to the second reflector and is reflected by the second reflector, then passes through the second lens to the second-order coupler. The second reflector moves horizontally to generate a second optical path difference in the fourth-order light.

[0009] In one embodiment, the first optical path difference generator includes a first rotating body and a first reflector. The first-order light emitted by the first-order coupler passes through the first rotating body and is reflected by the first reflector, then passes through the first rotating body and is sent back to the first-order coupler. The first rotating body rotates to generate a first optical path difference in the first-order light.

[0010] In one embodiment, the second optical path difference generator includes a second rotating body and a second reflector. The fourth-order light emitted from the second-order coupler passes through the second rotating body and is reflected by the second reflector, then passes through the second rotating body and is sent back to the second-order coupler. The second rotating body rotates to generate a second optical path difference from the fourth-order light.

[0011] In one embodiment, the first rotational speed of the first rotating body and the second rotational speed of the second rotating body are adjusted to maximize the signal difference between the first detection signal received by the first detector and the second detection signal received by the second detector, so as to achieve balanced detection of the first detection signal and the second detection signal.

[0012] In one embodiment, after the first rotational speed of the first rotating body and the second rotational speed of the second rotating body are adjusted, the first rotational speed is greater than the second rotational speed, so that the amount of data of the first detection signal received by the first detector is greater than the amount of data of the second detection signal received by the second detector.

[0013] In one embodiment, the first optical path difference generator further includes a first medium that can be moved in / out, selectively moving in between the first rotator and the first reflector or out of the first optical path difference generator, so that the first primary light incident on the first optical path difference generator generates a first optical path difference; the second optical path difference generator further includes a second medium that can be moved in / out, selectively moving in between the second rotator and the second reflector or out of the second optical path difference generator, so that the second primary light incident on the second optical path difference generator generates a second optical path difference.

[0014] In one embodiment, the optical biometer further includes an optical switch disposed between the second-order coupler and the second optical element group for controlling the opening or closing of the second optical element group.

[0015] In one embodiment, the optical biometer further includes a galvanometer or a motor, wherein the scanning times of the first optical element group and the second optical element group are synchronized or partially overlapped with each other, and the galvanometer or motor is moved during non-scanning times to scan different locations / interfaces of the eye.

[0016] In one embodiment, the optical biometer further includes: a polarization beam splitter disposed between a first optical element group, a second optical element group, and an eye; a first polarizer disposed between the first optical element group and the polarization beam splitter for polarizing a second-order light and then directing it to the eye through the polarization beam splitter; and a second polarizer disposed between the second optical element group and the polarization beam splitter for polarizing a third-order light and then directing it to the eye through the polarization beam splitter.

[0017] Compared to existing technologies, the optical biometer proposed in this invention can not only simultaneously measure different positions / interfaces of the eye to save time, but also reduce errors caused by human eye / machine movement, reduce measurement signal loss, and quickly scan optical coherence tomography (OCT) signals by moving the position.

[0018] The advantages and spirit of the present invention can be further understood through the following detailed embodiments and accompanying drawings. Attached Figure Description

[0019] The accompanying drawings of this invention are described below:

[0020] Figure 1 This is a schematic diagram of an existing optical biometer.

[0021] Figure 2 This is a schematic diagram of an optical biometer according to a preferred embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of an optical biometer according to another preferred embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of an optical biometer according to another preferred embodiment of the present invention.

[0024] Figure 5 A timing diagram of the sensing results obtained by scanning four different interfaces of the eye using the first optical element group.

[0025] Figure 6A schematic diagram showing the first optical element group scanning four different interfaces of the eye, the second optical element group scanning the first three interfaces of the eye, and the first optical element group scanning the last interface of the eye.

[0026] Figure 7 A timing diagram of the sensing results obtained by scanning the first three interfaces of the eye with the second optical element group and scanning the last interface of the eye with the first optical element group.

[0027] Figures 8 to 12 , Figure 15 , Figures 18 to 21 These are schematic diagrams of different embodiments of the optical biometer of the present invention.

[0028] Figure 13 and Figure 14 They are respectively Figure 12 A time-series diagram of the scanning periods of corneal and retinal signals from an optical biometer.

[0029] Figure 16 and Figure 17 They are respectively Figure 15 Timing diagrams of different embodiments of the scanning and movement periods of corneal and retinal signals from an optical biometer.

[0030] Explanation of key component symbols:

[0031] 2, 3, 4, 8, 9, 10, 11, 12, 15, 18, 19, 21… Optical biometer

[0032] SLD…light source

[0033] L…incident light

[0034] CP… Primary Coupler

[0035] L1…First-order light

[0036] L2…Second Primary Light

[0037] L3…Third Initial Light

[0038] CP1…First-order coupler

[0039] L11…First Step Light

[0040] L12…Second tier of light

[0041] CP2…Second-order coupler

[0042] L21…Third-order light

[0043] L22…Fourth-order light

[0044] PDG1…First Optical Path Difference Generator

[0045] PDG2…Second optical path difference generator

[0046] OD1…First Optical Element Group

[0047] EYE…eyes

[0048] FD…First position / interface

[0049] LR1…First reflected light

[0050] OD2…Second Optical Element Group

[0051] PU…Second position / interface

[0052] LR2…Second reflected light

[0053] DET1…First Detector

[0054] LD1…First detection signal

[0055] DET2…Second Detector

[0056] LD2…Second detection signal

[0057] LD…detection signal

[0058] DET…detector

[0059] IC… Balanced Detection Circuit

[0060] BS…splitter

[0061] B1…First Rotating Body

[0062] R1…First reflector

[0063] B2…Second Rotating Body

[0064] R2…Second reflector

[0065] N1…First lens

[0066] N2…Second lens

[0067] ω1…First rotational speed

[0068] ω2…Second rotational speed

[0069] FPC…Spectrometer

[0070] SEN…Optical Sensing Module

[0071] WIN… window

[0072] SW…Optical Switch

[0073] M1…First Medium

[0074] M2…Second Medium

[0075] SC1~SC3… Scanning periods

[0076] GVX, GVY... galvanometer

[0077] MV1~MV2…Moving Time Period

[0078] SC1'~SC3'… Scanning period

[0079] ΔT…time period

[0080] P…First polarizer (or wave plate)

[0081] S…Second polarizer (or wave plate)

[0082] PBS…Polarized Spectrometer

[0083] CP3…1x2 Coupler

[0084] OD…Optical Components Group Detailed Implementation

[0085] Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Elements / components referred to by the same or similar reference numerals in the drawings and embodiments are used to represent the same or similar parts.

[0086] According to a specific embodiment of the present invention, there is an optical biometer. In this embodiment, the optical biometer is used to detect and measure the eye, but is not limited thereto. Please refer to... Figure 2 , Figure 2 A schematic diagram of the optical biometer of this embodiment.

[0087] like Figure 2 As shown, the optical biometer 2 includes a light source SLD, a primary coupler CP, a first-order coupler CP1, a second-order coupler CP2, a first optical path difference generator PDG1, a second optical path difference generator PDG2, a first optical element group OD1, a second optical element group OD2, a beam splitter BS, a first detector DET1, and a second detector DET2.

[0088] The light source SLD emits incident light L. The primary coupler CP receives the incident light L and emits first primary light L1 and second primary light L2. The first primary coupler CP1 receives the first primary light L1 and emits first primary light L11 and second primary light L12. The second primary coupler CP2 receives the second primary light L2 and emits third primary light L21 and fourth primary light L22.

[0089] The first optical path difference generator PDG1 receives the first-order light L11 and emits the first-order light L11 with a first optical path difference to the first-order coupler CP1. In this embodiment, the first optical path difference generator PDG1 includes a first lens N1 and a first reflector R1. The first-order light L11 emitted by the first-order coupler CP1 passes through the first lens N1 and is reflected by the first reflector R1, then passes through the first lens N1 and returns to the first-order coupler CP1. It should be noted that the first reflector R1 moves horizontally to change the time it takes for the first reflector R1 to reflect the first-order light L11, thereby enabling the first-order light L11 to generate the first optical path difference.

[0090] The second optical path difference generator PDG2 receives the fourth-order light L22 and emits the fourth-order light L22 with a second optical path difference to the second-order coupler CP2. In this embodiment, the second optical path difference generator PDG2 includes a second lens N2 and a second reflector R2. The fourth-order light L22 emitted by the second-order coupler CP2 passes through the second lens N2, is reflected by the second reflector R2, and then passes through the second lens N2 back to the second-order coupler CP2. It should be noted that the second reflector R2 moves horizontally to change the time it takes for the second reflector R2 to reflect the fourth-order light L22, thereby generating a second optical path difference in the fourth-order light L22.

[0091] The first optical element group OD1 is used to direct the second-order light L12 to the first position / interface FD of the eye EYE via the beam splitter BS, and then, after receiving the first reflected light LR1 from the first position / interface FD via the beam splitter BS, direct it to the first-order coupler CP1. The second optical element group OD2 is used to direct the third-order light L21 to the second position / interface PU of the eye EYE via the beam splitter BS, and then, after receiving the second reflected light LR2 from the second position / interface PU via the beam splitter BS, direct it to the second-order coupler CP2.

[0092] It should be noted that the optical biometer 2 is equipped with two optical element groups (first optical element group OD1 and second optical element group OD2). For example, the first optical element group OD1 can be used to measure the interface near the cornea, and the second optical element group OD2 can be used to measure the interface near the retina. Since neither the first optical element group OD1 nor the second optical element group OD2 needs to scan a long distance, the measurement time can be effectively shortened.

[0093] The first detector DET1 receives a first detection signal LD1 generated by the first-order coupler CP1 based on the first-order light L11 with a first optical path difference and the first reflected light LR1. The second detector DET2 receives a second detection signal LD2 generated by the second-order coupler CP2 based on the fourth-order light L22 with a second optical path difference and the second reflected light LR2. In this embodiment, the first position / interface FD is the retina and the first detection signal LD1 is related to the retina; the second position / interface PU is the cornea and the second detection signal LD2 is related to the cornea.

[0094] In another embodiment, please refer to Figure 3 , Figure 3 A schematic diagram of the optical biometer of this embodiment. (See diagram below.) Figure 3 As shown, the optical biometer 3 includes a light source SLD, a primary coupler CP, a first-order coupler CP1, a second-order coupler CP2, a first optical path difference generator PDG1, a second optical path difference generator PDG2, a first optical element group OD1, a second optical element group OD2, a beam splitter BS, a first detector DET1, and a second detector DET2.

[0095] It should be noted that, Figure 3 Optical biometer 3 and Figure 2 The optical biometer 2 differs in that: Figure 3 The first optical path difference generator PDG1 of the optical biometer 3 includes a first rotating body B1 and a first reflector R1. The first-order light L11 emitted by the first-order coupler CP1 passes through the first rotating body B1, is reflected by the first reflector R1, and then passes back to the first-order coupler CP1 through the first rotating body B1. The first rotating body B1 rotates to generate a first optical path difference in the first-order light L11.

[0096] Similarly, Figure 3 The second optical path difference generator PDG2 of the optical biometer 3 includes a second rotating body B2 and a second reflector R2. The fourth-order light L22 emitted from the second-order coupler CP2 passes through the second rotating body B2, is reflected by the second reflector R2, and then passes back to the second-order coupler CP2. The second rotating body B2 rotates to generate a second optical path difference in the fourth-order light L22.

[0097] Please refer to Figure 4 , Figure 4 This is a schematic diagram of an optical biometer according to another preferred embodiment of the present invention. Figure 4As shown, firstly, both the first rotating body B1 and the second rotating body B2 rotate at the same initial speed, each finding an angle with a signal, corresponding to the cornea and retina respectively. Then, the speeds of the first rotating body B1 and the second rotating body B2 are adjusted to the first speed ω1 and the second speed ω2 respectively, so that the corneal and retinal signals corresponding to the first rotating body B1 and the second rotating body B2 are synchronized, thereby achieving the effect of synchronous measurement.

[0098] It should be noted that an optical switch SW is provided between the second-order coupler CP2 and the second optical element group OD2 to control the opening and closing of the second optical element group OD2. For example, for eyes with shorter axial lengths, the second optical element group OD2 can be closed to save energy, while for eyes with longer axial lengths, the second optical element group OD2 can be opened to accelerate measurement (saving time). This embodiment measures the axial length from the outermost layer of the cornea to the outermost layer of the retina simultaneously; however, it can also be modified to measure the axial length of the inner and outer layers of the lens or the axial length of the cornea, etc. Its advantage is that it can minimize the time difference between different interfaces of the eye eye, thereby avoiding errors caused by eye / machine movement.

[0099] Please refer to Figures 5 to 7 , Figure 5 A timing diagram of the sensing results obtained by scanning the four interfaces of the eye's eye (e.g., cornea, anterior to the lens, posterior to the lens, and retina) for the first optical element group OD1;

[0100] Figure 6 A schematic diagram showing the first optical element group OD1 scanning the four interfaces of the eye eye (e.g., cornea, anterior to the lens, posterior to the lens, and retina), the second optical element group OD2 scanning the first three interfaces of the eye eye, and the first optical element group OD1 scanning the last interface. Figure 7 The timing diagram shows the sensing results obtained by scanning the first three interfaces of the eye eye with the second optical element group OD2 and scanning the last interface of the eye eye with the first optical element group OD1.

[0101] Please refer to Figures 8 to 12 , Figures 8 to 12 These are schematic diagrams of different embodiments of the optical biometer of the present invention.

[0102] like Figure 8 As shown, the optical biometer 8 includes a light source SLD, a primary coupler CP, a first-order coupler CP1, a second-order coupler CP2, a first optical path difference generator PDG1, a second optical path difference generator PDG2, a first optical element group OD1, a second optical element group OD2, a first detector DET1, and a second detector DET2.

[0103] The first optical path difference generator PDG1 of the optical biometer 8 includes a first rotating body B1 and a first reflector R1. The first-order light L11 emitted by the first-order coupler CP1 passes through the first rotating body B1, is reflected by the first reflector R1, and then passes back to the first-order coupler CP1 through the first rotating body B1. The first rotating body B1 rotates to generate a first optical path difference in the first-order light L11.

[0104] Similarly, the second optical path difference generator PDG2 of the optical biometer 8 includes a second rotating body B2 and a second reflector R2. The fourth-order light L22 emitted by the second-order coupler CP2 passes through the second rotating body B2, is reflected by the second reflector R2, and then passes back to the second-order coupler CP2. The second rotating body B2 rotates to generate a second optical path difference in the fourth-order light L22.

[0105] Please refer to Figure 9 , Figure 9 and Figure 8 The difference lies in the following: The first-order coupler CP1 of the optical biometer 9 receives the first primary-order light L1 and emits the first primary-order light L11 and the second primary-order light L12 to the first optical path difference generator PDG1 and the second optical path difference generator PDG2, respectively. The second-order coupler CP2 receives the second primary-order light L2 and emits the third primary-order light L21 and the fourth primary-order light L22 to the first optical element group OD1 and the second optical element group OD2, respectively. The detector DET receives the detection light LD transmitted by the primary-order coupler CP. The rest can be deduced similarly.

[0106] It should be noted that the first rotating body B1 of the first optical path difference generator PDG1 and the second rotating body B2 of the second optical path difference generator PDG2 initially rotate at the same initial speed but are 90 degrees apart from each other. This utilizes their respective dead zones to avoid interfering with each other's signals, and they then identify the corresponding angular regions of the cornea and retina. Next, the rotation speeds of the first rotating body B1 of the first optical path difference generator PDG1 and the second rotating body B2 of the second optical path difference generator PDG2 are adjusted so that the signals from the corresponding cornea and retina appear simultaneously, achieving a synchronized measurement effect.

[0107] Please refer to Figure 10 , Figure 10 and Figure 9 The difference is: Figure 10 The optical biometer 10 uses a first switching mirror SP1 and a second switching mirror SP2 to replace Figure 9 The optical biometer 9 uses a first-order coupler CP1 and a second-order coupler CP2 to achieve energy-saving effects. The rest can be deduced similarly.

[0108] Please refer to Figure 11 , Figure 11 and Figure 8 The difference is: Figure 11 The optical biometer 11 also includes a balance detection circuit IC, which is coupled to the first detector DET1 and the second detector DET2, respectively. The first rotating body B1 of the first optical path difference generator PDG1 and the second rotating body B2 of the second optical path difference generator PDG2 first rotate at the same initial speed to find the corresponding angular regions of the cornea and retina, respectively. Then, the rotation speeds of the first rotating body B1 of the first optical path difference generator PDG1 and the second rotating body B2 of the second optical path difference generator PDG2 are adjusted so that the maximum signals of the corresponding cornea and retina appear with the greatest time difference. This allows the balance detection circuit IC to ensure that one signal is subtracted from the background, thereby minimizing the interference between the two balanced detection signals.

[0109] Please refer to Figure 12 , Figure 12 and Figure 8 The difference is: Figure 12 The primary coupler CP of the optical biometer 12 is used to receive incident light L and emit first primary light L1, second primary light L2 and third primary light L3 to the first optical path difference generator PDG1, the eye EYE and the second optical path difference generator PDG2 respectively.

[0110] In addition to the first rotating body B1 and the first reflector R1, the first optical path difference generator PDG1 also includes a first medium M1 that can be moved in and out. The first medium M1 can be selectively moved between the first rotating body B1 and the first reflector R1 or removed from the first optical path difference generator PDG1 by moving it up and down, so that the first primary light L1 incident on the first optical path difference generator PDG1 generates a first optical path difference. For example, when measuring the cornea, the first medium M1 is moved in to increase the optical path, causing the light to be focused on the cornea; when measuring the retina, the first medium M1 is removed to decrease the optical path, causing the light to be focused on the retina.

[0111] Similarly, the second optical path difference generator PDG2, in addition to including the second rotating body B2 and the second reflector R2, also includes a movable second medium M2. The second medium M2 can be selectively moved between the second rotating body B2 and the second reflector R2 or removed from the second optical path difference generator PDG2 by moving it up and down, so that the third primary light L3 incident on the second optical path difference generator PDG2 generates a second optical path difference. For example, when measuring the cornea, the second medium M2 is moved in to increase the optical path, causing the light to focus on the cornea; when measuring the retina, the second medium M2 is removed to decrease the optical path, causing the light to focus on the retina.

[0112] Please refer to Figure 13 and Figure 14 , Figure 13 and Figure 14 They are respectively Figure 12 A time-series diagram of the scanning periods of corneal and retinal signals from the optical biometer 12. (See attached image.) Figure 13 and Figure 14 As shown, the scanning periods SC1 and SC3 of the corneal signal are staggered from the scanning period SC2 of the retinal signal.

[0113] Please refer to Figure 15 , Figure 15 and Figure 8 The difference is: Figure 15 The optical biometer 15 also includes galvanometers GVX and GVY, positioned between the spectrometer BS and the eye EYE.

[0114] Please refer to Figure 16 and Figure 17 , Figure 16 and Figure 17 They are respectively Figure 15 Timing diagrams of different embodiments of the scanning and movement periods of corneal and retinal signals from the optical biometer 15. (See also...) Figure 16 As shown, the scanning periods SC1 and SC2 for corneal and retinal signals can be synchronized. Furthermore, during the movement period MV1, when neither the cornea nor the retina is scanned, the galvanometers GVX and GVY or the motor can be moved to scan different locations / interfaces within the eye's eye. For example... Figure 17 As shown, the scanning periods SC1 to SC3 of the corneal signal and SC1' to SC3' of the retinal signal can be spaced apart by a time interval ΔT and partially overlap to obtain good signals for simultaneous measurement. In addition, during the movement periods MV1 and MV2 when neither the cornea nor the retina is scanned, the galvanometers GVX and GVY or the motor can be used to scan different locations / interfaces within the eye's eye.

[0115] Please refer to Figure 18 Since the rotation speeds of the first rotating body B1 of the first optical path difference generator PDG1 and the second rotating body B2 of the second optical path difference generator PDG2 can be different, for example, considering that the retinal signal may be weak and more data needs to be collected and averaged to obtain a clearer retinal signal, the first rotation speed ω1 of the first rotating body B1 of the first optical path difference generator PDG1 can be set to twice the second rotation speed ω2 of the second rotating body B2 of the second optical path difference generator PDG2, so that the amount of retinal signal data obtained by the first detector DET1 is twice the amount of corneal signal data obtained by the second detector DET2, so as to obtain a clearer retinal signal after averaging.

[0116] Please refer to Figure 19 , Figure 19 The optical biometer 19 also includes a first polarizer (or waveplate) P and a second polarizer (or waveplate) S, and uses a polarization beam splitter PBS instead of the original beam splitter BS. The first polarizer (or waveplate) P is disposed between the first optical element group OD1 and the polarization beam splitter PBS, and the second polarizer (or waveplate) S is disposed between the second optical element group OD2 and the polarization beam splitter PBS. The first polarizer (or waveplate) P and the second polarizer (or waveplate) S can polarize the second-order light L12 and the third-order light L21 respectively, and then transmit them to the eye EYE through the polarization beam splitter PBS, thereby effectively reducing optical signal loss. As for Figure 20 This is a schematic diagram illustrating how the original beam splitter BS causes optical signal loss.

[0117] Please refer to Figure 21 , Figure 21 The optical biometer 21 uses a 1x2 coupler CP3 to replace the original beam splitter BS in order to effectively reduce optical signal loss.

[0118] Compared with existing technologies, the optical biometer proposed in this invention can not only simultaneously measure different positions / interfaces of the eye to save time, but also reduce errors caused by human eye / machine movement, reduce measurement signal loss, and quickly scan optical coherence tomography (OCT) signals of axial length / eye shape by moving position.

[0119] The embodiments described above are only for the purpose of illustrating the present invention and are not intended to limit it. Without departing from the spirit and scope of the present invention, various simple modifications and alterations made by those skilled in the art based on the scope of the patent application and the description of the invention should still be included within the scope of protection claimed in the patent application documents.

Claims

1. An optical biometer, characterized in that, Include: A light source, used to emit an incident light; A primary coupler is used to receive the incident light and emit a first primary light and a second primary light respectively; A first-order coupler is used to receive the first-order light and emit a first-order light and a second-order light respectively; A second-order coupler is used to receive the second primary-order light and emit a third-order light and a fourth-order light respectively; A first optical path difference generator is used to receive the first-order light and emit the first-order light with a first optical path difference to the first-order coupler. A second optical path difference generator is used to receive the fourth-order light and emit the fourth-order light with a second optical path difference to the second-order coupler. a beam splitter; A first optical element group is used to direct the second-order light to a first position / interface of an eye through the beam splitter and to direct a first reflected light from the first position / interface to the first-order coupler through the beam splitter. A second optical element group is used to direct the third-order light to a second position / interface of the eye through the beam splitter and to direct a second reflected light from the second position / interface to the second-order coupler through the beam splitter. A first detector is used to receive a first detection signal generated by the first first-order coupler based on the first-order light having the first optical path difference and the first reflected light; as well as A second detector is used to receive a second detection signal generated by the second-order coupler based on the fourth-order light having the second optical path difference and the second reflected light.

2. The optical biometer as described in claim 1, characterized in that, The first location / interface is the retina and the first detection signal is related to the retina.

3. The optical biometer as described in claim 1, characterized in that, The second location / interface is the cornea and the second detection signal is related to the cornea.

4. The optical biometer as described in claim 1, characterized in that, The first optical path difference generator includes a first lens and a first reflector. The first-order light emitted by the first first-order coupler passes through the first lens and is reflected by the first reflector, then passes through the first lens and is sent back to the first first-order coupler. The first reflector moves in the horizontal direction to generate the first optical path difference.

5. The optical biometer as described in claim 4, characterized in that, The second optical path difference generator includes a second lens and a second reflector. The fourth-order light emitted by the second second-order coupler passes through the second lens and is reflected by the second reflector, then passes through the second lens and is sent back to the second second-order coupler. The second reflector moves in the horizontal direction to generate the second optical path difference from the fourth-order light.

6. The optical biometer as described in claim 1, characterized in that, The first optical path difference generator includes a first rotating body and a first reflector. The first-order light emitted by the first-order coupler passes through the first rotating body and is reflected by the first reflector. It then passes through the first rotating body and is sent back to the first-order coupler. The first rotating body rotates to generate the first optical path difference from the first-order light.

7. The optical biometer as described in claim 6, characterized in that, The second optical path difference generator includes a second rotating body and a second reflector. The fourth-order light emitted by the second second-order coupler passes through the second rotating body and is reflected by the second reflector, then passes through the second rotating body and is sent back to the second second-order coupler. The second rotating body rotates to generate the second optical path difference from the fourth-order light.

8. The optical biometer as described in claim 7, characterized in that, After the first rotational speed of the first rotating body and the second rotational speed of the second rotating body are adjusted, the signal difference between the first detection signal received by the first detector and the second detection signal received by the second detector is maximized, so as to achieve balanced detection of the first detection signal and the second detection signal.

9. The optical biometer as described in claim 7, characterized in that, After the first rotational speed of the first rotating body and the second rotational speed of the second rotating body are adjusted, the first rotational speed is greater than the second rotational speed, so that the amount of data of the first detection signal received by the first detector is greater than the amount of data of the second detection signal received by the second detector.

10. The optical biometer as described in claim 7, characterized in that, The first optical path difference generator further includes a first medium that can be moved in / out, selectively moving into or out of the first optical path difference generator between the first rotating body and the first reflector, so that the first primary light incident on the first optical path difference generator generates the first optical path difference; the second optical path difference generator further includes a second medium that can be moved in / out, selectively moving into or out of the second optical path difference generator between the second rotating body and the second reflector, so that the second primary light incident on the second optical path difference generator generates the second optical path difference.

11. The optical biometer as described in claim 1, characterized in that, Also includes: An optical switch is disposed between the second-order coupler and the second optical element group to control the opening or closing of the second optical element group.

12. The optical biometer as described in claim 1, characterized in that, The optical biometer also includes a galvanometer or a motor, the scanning times of the first optical element group and the second optical element group are synchronized or partially overlapped, and the galvanometer or the motor is moved during non-scanning times to scan different positions / interfaces of the eye.

13. The optical biometer as described in claim 1, characterized in that, Also includes: A polarization beam splitter is disposed between the first optical element group, the second optical element group, and the eye; A first polarizer is disposed between the first optical element group and the polarization beam splitter to polarize the second-order light and then direct it to the eye through the polarization beam splitter. as well as A second polarizer is disposed between the second optical element group and the polarization beam splitter to polarize the third-order light and then project it through the polarization beam splitter to the eye.

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