JPS6028401Y2 - Screening machine used for optometry, etc. - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a radiograph for measuring the degree of antangular anomalousness of the eye or the power (degree) of a necessary corrective lens for the eye.

In the conventional Skia 5copy method, a test lens is used in front of the patient's eyes to make a parallel beam of light enter the eye, capture the reflected light from the fundus, and then rotate the Scanascope to the left and right as needed to direct the beam into the patient's eye. The angle of the light was changed and the direction of movement of the reflected light was used to measure the degree of refractive correction of the patient's eye by the lens used in front of the eye.

In other words, if the moving direction of the parallel rays passing in front of the eye and the moving direction of the reflected image are opposite, then if they are orthogonal, a positive addition is required.
If it remains still, it indicates that the correction is correct.

(This is a theoretically known fact.) However, this conventional scanoscopy method uses a plated lens in front of the eye, which has the disadvantage that children and infants in particular resist it and cannot perform diagnosis or examination. .

Therefore, the present invention does not use a lens with a plate, but an insert lens plate (
A slit image is placed near the examiner (also called a recos plate), and the slit image is brought near the far point of the patient's eye, and the degree of flexural aberration of the patient's eye is determined by observing the alignment and retrograde movement of the slit image. This method is unique in that it attempts to measure the power of a corrective lens.

The content of the present invention will be explained below.

Regarding the first embodiment (FIGS. 1 to 3).

Reference numeral 1 denotes an image inspection mechanism, which mainly consists of an incandescent light bulb slit 3 as a light source 2, a perforated reflector 4, and a rotating lens plate 5. None.

Reference numeral 6 denotes a condensing lens, and 7 a lens for focusing, which should be moved appropriately in the direction of arrow C or D.

8 is the through hole of the perforated reflector 4, 9 is the examiner's eye, and 10 is the examinee's eye, and the distance from the optical axis P is 50 cm to 75C71.
It is out of position.

The above-mentioned rotating lens plate 5 is designed to be rotated in a stepwise manner about the rotation axis 11, and has an example of a convex lens having an appropriate degree (power) on a concentric circle of the rotation axis 11. ), -2D (-2 diopters), . . . or concave lenses, etc., known power lenses 12, 12A, 12B, . . . are sequentially arranged stepwise.

This rotating lens plate 5 is incorporated as a part of the imaging mechanism 1, and is normally located at the arrow A of the optical system of the light source 2, condenser lens 6, slit 3, lens 7, and perforated reflector 4 on the optical axis P1. Or, the rotational movement in the B direction and the declination rotation are carried out simultaneously, but only the rotating lens plate 5 is rotated independently with the rotational axis 11 parallel to the optical axis P0.
It may also be configured to rotate in the force direction of arrow A' or B' with A as the center.

Further, the rotating lens plate 5 is moved as appropriate with the arrow E centered around the rotating shaft 11.
Alternatively, one of the selected known power lenses 12, 12A, 12B, . . . can be positioned on the optical axis P2 by stepwise deflection in the F direction.

By moving the lens 7 in the direction of arrow C or D,
Known power lens 12.12A of rotating lens plate 5...
It has the function of converting a step change caused by the selection of... into a continuous change.

On the other hand, there is also a method in which the lens 7 is primarily moved and the rotary lens plate 5 is auxiliarily rotated to expand the focal range and an appropriate known power lens 12, 12A, etc. is selected.

Next, the operation mode of the present invention having the above configuration will be explained.

The light from the light source 2 is bent and reflected at 45° by the perforated reflector 4, and is then reflected by the known power lens 12 selected by the rotating lens plate 5.
The slit images 3A, 3 reach the subject's eye 10 through the
B and 3C are also projected linearly onto the subject's eye 10.

(Fig. 3) In this state, taking the examination mechanism 1 as an example, arrow A
If the slit images 3A, 3B, and C are integrally aligned in the direction of the arrow G, it can be said that the eye is neutralized and the eye is normal.

Next, when the inspection mechanism 1 is similarly deflected in the direction of arrow A, the slit images 3A and 3C move in the direction of arrow G, and the slit image 3B moves backward in the direction of arrow H, indicating a state of myopia.

The known power lens 12 by appropriately rotating the declination angle of 5,
One of 12A, 12B, . . . is positioned on the optical axis P2 to form a slit image 3A.

By finding the point where 3B and 3C coexist, it is possible to measure the degree of flexural anomalousness of the subject's eye 10 or the power (degree) of the corrective lens.

Furthermore, the examination mechanism 1 is similarly deflected in the direction of arrow A, and the slit images 3A and 3C move together in the direction of arrow G, and the slit image 3
If B moves in the direction of arrow G with a slight delay, it can be seen that the object is farsighted.

To find out the degree of farsightedness, the rotary lens plate 5 is rotated to an appropriate declination angle, and the known power lenses 12, 12A, 12B...
By positioning one of them on the optical axis P2 and finding a point where the slit images 3A, 3B, and 3G coexist, the degree of antangulation of the subject's eye 10 or the power of the corrective lens can be determined. (degree) can be measured.

Regarding the second embodiment (FIG. 4) In this embodiment, the same parts as in the first embodiment are given the same numbers.

A feature of this embodiment is that a zoom lens system 13 is used to change the magnification of the slit images 3A, 3B, and 3C.

The rest is the same as the first embodiment, so the explanation will be omitted.

Therefore, the present invention has the structure and function as described above, and in particular, the rotary lens plate 5 is placed within the examination mechanism, so there is no need to use a hand-held recording board as in the past, and it is possible to The distance from the human eye can be kept far away, and diagnosis, examination, etc. can be carried out smoothly without giving a feeling of intimidation, especially to children and infants, and the entire examination mechanism 1 can be rotated around the optical axis P□ or with a rotating lens. Since the plate 5 is rotated in the declination angle around the rotation axis 11A, and the rotary lens plate 5 is rotated in the declination angle in a step manner around the rotation axis 11, the slit images are moved along and backward. This can be done by measuring the flexural anomalous degree of the examiner's eye, and it is also possible to measure the power (degree) of the corrective lens. 11A as the center, so if the optical axis P2 is set in advance to the visual axis of the examinee's eye, the examination mechanism itself will not be misaligned or deflected during the examination, ensuring that The moving direction of the slit image can be recognized.

Furthermore, since the focusing lens 7 is forced to move along the optical axis P1, the power lens 12 of the rotating lens plate 5,
12A... can be made into a continuous change from a step change by selection of 12A..., and furthermore, by mainly moving the focusing lens 7 and auxiliary rotation of the rotary lens plate 5 to expand the focal range, the appropriate power lens 12, There are great effects such as being able to select 12A...

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the first embodiment of the optical system of the present invention, FIG. 2 is an explanatory diagram of the rotating lens plate, and FIG. 3 is a diagram for explaining the relationship between the subject's eye and the slit image. FIG. 4 is an explanatory diagram of the optical system of the second embodiment. 1... Image inspection mechanism, 2... Light source, 3... Slit,
4... Perforated reflector, 5... Rotating lens plate, 3A,
3B. 3C...Slit image.

Claims (1)

[Scope of utility model registration request] A plurality of power lenses 12, 12A, .
A rotary lens plate 5 having a rotary lens plate 5 is positioned in the examination mechanism 1 along an optical axis P2 between the perforated reflector 4 and the object as the subject's eye 10, and the rotating lens plate 5 has a The light source 2, the slit 3, the focusing lens 7 moving on the optical axis P1, and the entire hole opening mechanism 1 are arranged on the optical axis P1.
Rotate the lens plate 5 around the axis of rotation 11
An image examination machine used for optometry, etc., which is configured to detect the moving direction of an image reflected on an object as a subject's eye 10 by rotating the angle of deviation about A.