TWM595481U - Retinoscopy device with off-axis parabolic mirror - Google Patents

Abstract

This creative department includes an off-axis parabolic mirror, a point light source part and a shading part. The off-axis parabolic mirror has a reflective surface and an opening. The shading part is located between the point light source part and the reflecting surface, and the point light source part emits a first light toward the shading part, and the first light passes through the shading part and becomes a second light beam with a long slit shape in cross section, and irradiates To the reflective surface; the second light is reflected by the reflective surface to become a third light, and illuminates the eye of a subject, the third light irradiates the eye of the subject and becomes a fourth light, and the fourth light After the retina of the subject’s eye is irradiated, it is reflected into a fifth ray. After the fifth ray is reflected out of the subject’s eye, it becomes a sixth ray and irradiates the reflective surface. The sixth ray passes through the opening and becomes a seventh ray for Observe with the eyes of an optometrist. This case has the advantages of a large applicable spectral range, good imaging quality and improved measurement accuracy.

Description

Retinal retinoscopy device of off-axis parabolic mirror

This creation relates to an off-axis parabolic retinal retinoscopy device, especially an off-axis parabolic retinal retinoscopy device with a large applicable spectral range and good imaging quality, which can improve measurement accuracy.

Referring to FIG. 7, a known retinal retinoscope is provided with a light-emitting element 71, a lens 72 and a plane mirror 73 on (or inside) a retinoscope body 70. Wherein, the flat mirror 73 is generally inclinedly disposed in the retinoscope body 70 and has a semi-reflective and semi-transparent structure. The light-emitting element 71 emits a light LA, the light LA passes through the lens 72 and becomes a parallel light LB. When the parallel light LB is irradiated to the plane mirror 73, it is partially reflected to the eye 91 of a subject, and then Retina 92, one of the subject's eyes 91, arrived. After that, a reflected light LC reflected back from the retina 92 leaves the subject's eye 91, then penetrates the plane mirror 73, and finally reaches the eye 93 of an optometrist. Since the light LA originally emitted by the light-emitting element 71 is divergent light, it is collected by the lens 72 into parallel light LB. If the lens 72 is made of general glass, the refractive index of the glass material is different due to the light of different wavelengths passing through Therefore, the problem of "dispersion" will occur. Therefore, it is known that the retinal retinoscopy lens must have the problem of dispersion because the light LA passes through the lens 72; of course, it also causes the disadvantage that its imaging image value is poor. In view of this, it is necessary to develop technology that can solve the above-mentioned conventional shortcomings.

The purpose of this creation is to provide an off-axis parabolic mirror retinal retinoscopy device, which has the advantages of a large applicable spectral range, good imaging quality and improved measurement accuracy. In particular, the problem to be solved in this creation lies in the fact that the known retinal ophthalmoscope must have a problem of dispersion because the light will pass through the lens; of course, it also causes the disadvantage of its poor imaging value. The technical means to solve the above problem is to provide an off-axis parabolic mirror retinoscopy device, which includes: An off-axis parabolic mirror with a reflective surface and an opening; A light source device is provided corresponding to the off-axis parabolic mirror. The light source device has a point light source part, a light blocking part, a rotating part and a driving part; the light blocking part is interposed between the point light source part and the reflecting surface And the shading part has a long slit, the rotating part is connected to the shading part, and the driving part is connected to the point light source part; Thereby, the point light source part emits a first light toward the shading part, and after passing through the elongated slit, the first light becomes a second slit-shaped second ray and irradiates to The reflective surface is used to rotate the shading portion to change the cross-sectional direction of the second light when the rotating portion is activated; and to drive the point light source portion and the reflective surface when the driving portion is activated Relative movement, used to control the focusing of the second light on the reflective surface of the focus; after the second light is reflected by the reflective surface, it becomes a third light and is used to illuminate the eyes of a subject, When the third light irradiates the eye of the subject, it becomes a fourth light. After the fourth light is irradiated toward the retina of the eye of the subject, it is reflected by the retina and becomes a fifth light. The fifth light After the light reflects out of the subject's eyes, it becomes a sixth light and illuminates the reflective surface. The sixth light passes through the opening and becomes a seventh light. The seventh light is for the eye of an optometrist Observed. It is not difficult to gain an in-depth understanding from the detailed description and drawings of the selected embodiments below for the above purpose and advantages of this creation. The following examples and drawings are used to explain this creation in detail:

Referring to Figures 1, 2A, 2B and 3, this creation is an off-axis parabolic mirror retinoscopy device, which includes: An off-axis parabola (Off-axis Parabola, OAP for short) 10 has a reflective surface 11 and an opening 12. A light source device 20 corresponding to the off-axis parabolic mirror 10 is provided. The light source device 20 has a one-point light source part 21, a light shielding part 22, a rotating part 23 and a driving part 24. The shading portion 22 is interposed between the point light source portion 21 and the reflective surface 11, and the shading portion 22 has a long slit 221, the rotating portion 23 is connected to the shading portion 22, and the driving portion 24 The point light source unit 21 is connected. Thereby, the point light source portion 21 emits a first light L1 toward the light-shielding portion 22, and the first light L1 passes through the elongated slit 221 and becomes a first slit-shaped cross section Two light rays L2 are irradiated to the reflective surface 11, and when the rotating portion 23 is activated, it is used to rotate the light blocking portion 22 to change the cross-sectional direction of the second light L2 (known technology, not shown in the figure, together Chen Ming). And when the driving part 24 is started, it is used to drive the point light source part 21 and the reflective surface 11 to move relative to each other (the distance between any two objects is changed, which is a well-known technology, not shown in the figure, which is described in advance), and It is used to control the focusing and focusing of the second light L2 on the reflective surface 11. The second light L2 is reflected by the reflective surface 11 and becomes a third light L3 and used to illuminate the eye 91 of a subject. The third light L3 is irradiated to the eye 91 of the test and becomes a fourth After the light L4, the fourth light L4 is irradiated toward the retina 92 of the eye 91 of the subject. The fourth light L4 is reflected by the retina 92 to become a fifth light L5. After the fifth light L5 reflects out of the subject's eye 91, it becomes a sixth light L6 and irradiates the reflective surface 11 The six rays L6 pass through the opening 12 and become a seventh ray L7. The seventh ray L7 is for the eye 93 of an optometrist to observe. In practice, the opening 12 has a diameter D, which can be about 0.5 cm. Referring to FIG. 3, the rotating part 23 may include a rotating power motor 231 and a transmission gear 232. The shading portion 22 may have a circular plate structure, and has a driven peripheral surface 222 corresponding to the transmission gear 232, which is in mesh with the transmission gear 232. As a result, the rotary power motor 231 rotates the shading portion 22 through the transmission gear 232, thereby changing the cross-sectional direction of the second light L2. The driving part 24 may include a driving motor 241 and a sliding seat 242. The drive motor 241 is connected (there are many known connection methods, such as: connection through a speed reducer, connection through a related speed reduction device, ..., which will not be repeated), the point light source section 21, the point light source section 21 is erected on the slide 242 on. Thereby, the driving motor 241 is used to drive the point light source portion 21 so that the point light source portion 21 moves relative to the reflective surface 11 on the sliding base 242. The point light source section 21 may have an LED structure. The operation method of this creation is as follows: When the point light source portion 21 is controlled to emit the first light L1 toward the light-shielding portion 22, the first light L1 passes through the elongated slit 221, and then becomes a second light L2 with a slit-shaped cross section And illuminate to the reflective surface 11. After being reflected by the reflective surface 11, the second light L2 becomes a third light L3 and illuminates the eye 91 of the subject, and then becomes a fourth light L4, and the fourth light L4 is directed toward the subject After the retina 92 of the eye 91 is irradiated, it is reflected by the retina 92 and becomes the fifth light L5. After being reflected off the eye 91 of the subject, the fifth light L5 becomes the sixth light L6 and irradiates toward the reflective surface 11. The sixth light L6 passes through the opening 12 and becomes the seventh light L7. The seventh light L7 is for observation by the eye 93 of the optometrist. Further, when the off-axis parabolic retinal retinoscopy device and the subject's eye 91 are controlled to be relatively distant and relatively close, respectively, the fifth light L5 follows the synchronous state (see 4A to Figure 4B), the reverse motion state (see Figures 5A to 5B), and the neutralization state changes between at least one of the neutralization states (as shown in Figure 6), which represents the off-axis parabolic mirror retina The retinoscopy device and the subject's eye 91 have the correct focal distance (this focal distance is a well-known technology and will not be described in detail). The main point of this creation is that the off-axis parabolic mirror 10 improves the uniformity of the third light beam L3 (strip beam), which is helpful for refractive errors (known as optometry detection, which will not be repeated). Observe and improve measurement accuracy. The off-axis parabola (Off-axis Parabola, OAP for short) 10 can convert plane waves to spherical waves with high precision, and vice versa. Compared with a parabolic mirror or an elliptical mirror, the off-axis parabolic (reflective) mirror 10 has no central hole, so that the light projected on the entire aperture of the off-axis parabolic (reflective) mirror 10 can be focused on the detector. The off-axis parabolic mirror 10 can be used in a very wide wavelength range, providing a high numerical aperture similar to an aspheric lens without chromatic aberration. Ideal for collecting light and focusing it on the detector. The advantages and functions of this creation are as follows: [1] The applicable spectral range is large. Since there is no lens in this case, there will be no dispersion problem of traditional retinal retinoscopy. In other words, the spectrum range applicable in this case is relatively large. [2] The imaging quality is good and the measurement accuracy can be improved. Since there is no dispersion problem in this case, the imaging quality is good, it is easy to observe, and the measurement accuracy can be improved. Therefore, the imaging quality is good and the measurement accuracy can be improved. The above is only a detailed description of the creation through the preferred embodiment. Any simple modifications and changes made to the embodiment will not deviate from the spirit and scope of the creation.

10: Off-axis parabolic mirror 11: Reflective surface 12: opening 20: Light source device 21: Point light source 22: Shade 221: Long slit 222: Driven circumferential surface 23: Rotating part 231: Rotating power motor 232: Transmission gear 24: drive section 241: drive motor 242: Slide 70: Retinoscope body 71: Light emitting element 72: lens 73: flat mirror 91: Subject's eyes 92: Retina 93: Eye of the Optometrist L1: first light L2: second light L3: third light L4: fourth light L5: Fifth light L6: sixth light L7: seventh light D: diameter LA: light LB: parallel light LC: reflected light

Figure 1 is a schematic diagram of this creation Figure 2A is a schematic diagram of one of the light source irradiation states of this creation Figure 2B is a schematic diagram of the second light source irradiation state of this creation Figure 3 is a schematic diagram of an embodiment of the rotating part and the driving part of this creation Figures 4A to 4B are schematic diagrams of changes in the sequential state of the fundus reflected light (fifth or sixth light) in this creation Figures 5A and 5B are schematic diagrams of the reversed state changes of the fundus reflected light (fifth or sixth light) in this creation Figure 6 is a schematic diagram of the neutralization state of the reflected light (fifth light or sixth light) in this creation Figure 7 is a schematic diagram of a known device

10: Off-axis parabolic mirror

11: Reflective surface

12: opening

20: Light source device

21: Point light source

22: Shade

24: drive section

91: Subject's eyes

93: Eye of the Optometrist

D: diameter

Claims (6)

An off-axis parabolic mirror retinoscopy device includes: An off-axis parabolic mirror with a reflective surface and an opening; A light source device is provided corresponding to the off-axis parabolic mirror. The light source device has a point light source part, a light blocking part, a rotating part and a driving part; the light blocking part is interposed between the point light source part and the reflecting surface And the shading part has a long slit, the rotating part is connected to the shading part, and the driving part is connected to the point light source part; Thereby, the point light source part emits a first light toward the shading part, and after passing through the elongated slit, the first light becomes a second slit-shaped second ray and irradiates to The reflective surface is used to rotate the shading portion to change the cross-sectional direction of the second light when the rotating portion is activated; and to drive the point light source portion and the reflective surface when the driving portion is activated Relative movement, used to control the focusing of the second light on the reflective surface of the focus; after the second light is reflected by the reflective surface, it becomes a third light and is used to illuminate the eyes of a subject, When the third light irradiates the eye of the subject, it becomes a fourth light. After the fourth light is irradiated toward the retina of the eye of the subject, it is reflected by the retina and becomes a fifth light. The fifth light After the light reflects out of the subject's eyes, it becomes a sixth light and illuminates the reflective surface. The sixth light passes through the opening and becomes a seventh light. The seventh light is for the eye of an optometrist Observed. The off-axis parabolic retinal retinoscopy device of claim 1, wherein the opening has a diameter. The off-axis parabolic retinal retinoscopy device according to claim 2, wherein the diameter is 0.5 cm. The off-axis parabolic mirror retinoscopy device according to claim 1, wherein: The rotating part includes a rotating power motor and a transmission gear; The shading part is a circular plate structure, and has a driven circumferential surface corresponding to the transmission gear, which is in mesh with the transmission gear; Thereby, the rotary power motor rotates the shading portion through the transmission gear, and then changes the cross-sectional direction of the second light. The off-axis parabolic mirror retinoscopy device according to claim 1, wherein: The driving part includes a driving motor and a sliding seat; The driving motor is connected to the point light source part, and the point light source part is erected on the slide base; Thereby, the driving motor is used to drive the point light source part, so that the point light source part moves relative to the reflective surface on the sliding base. The off-axis parabolic mirror retinal retinoscopy device according to claim 1, wherein the point light source unit is an LED structure.

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