JPH11151204A - Refractometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine the refractivity of a lens with ease and at a low cost by providing a reflecting means for reflecting determined light to an instrument main body and a holding mechanism for holding an optional lens in the state of being attachable and detachable between the instrument main body and the reflecting means for the mounting table of a hand-held refractometer. SOLUTION: The mounting table 2 is provided with a housing mounting part 21 for mounting the housing 11 of the instrument main body 1 determing the refractivity of an eye to be examined and an optional lens 4 and a grip mounting part 22 for mounting a grip 12. In addition, the table 2 is provided with a wall body 23 positioned on the front surface of the mounted main body 1 and a reflector 3 is fixed onto the side surface on the side of the main body of the wall body 23 to allow the reflector 3 to reflect light to be measured, which is through a determination window 11a from the main body, toward the main body. Reflected light to be determined is photodetected by the photodetector 15a of a photodetective optical system 15 within the main body 1. Then, the holding mechanism 5 is provided between the reflector 3 and the window 11a of the main body 1 to hold the optional lens 4 to be determined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refractive power measuring device for objectively measuring the refractive power of an eye to be examined, and more particularly to a refractive power measuring device capable of measuring the refractive power of an arbitrary lens.

[0002]

2. Description of the Related Art Today, a spectacle shop or the like widely uses a refractive power measuring device for objectively measuring the refractive power of an eye to be examined. This refracting power measuring device projects the measuring light on the eye to be inspected, and measures the refracting power based on the amount of the measuring light reflected by the eye. According to the measurement principle, such a refractive power measuring device can measure the refractive power of various lenses such as an eyeglass lens and a contact lens in addition to the eye to be examined with almost the same device configuration. There has been proposed a refracting power measuring device capable of measuring the refracting power of light.

As examples of such a refracting power measuring device, Japanese Patent Application Laid-Open Nos. 63-53333 and 6-169891 have been proposed. Of these, in JP-A-63-53433, a support member is attached to a refractive power measuring device so as to be able to be pulled out, a diffusion surface is held near the end of the support member, and the diffusion surface is connected to the measurement device. Holding the lens in between. Then, the measuring light projected from the measuring device is reflected by the diffusing surface via the lens, and the refractive power of the lens is measured by receiving the reflected measuring light. In Japanese Patent Application Laid-Open No. 6-169891, the common functions of a stationary refractive power measuring device and a lens meter are shared, and both are combined.

[0004]

However, such a conventional refractive power measuring apparatus has the following problems. That is, in the case where the supporting member is attached to the refractive power measuring device as disclosed in JP-A-63-53433, it is difficult to use the device as a hand-held device because the weight of the device increases when the supporting member is fixedly attached. On the other hand, when the support member is detachably attached, there is a problem that the attachment of the support member is troublesome or the support member may be eliminated. Further, since the support member protrudes from the device, there is a problem that the support member is easily damaged when the device is carelessly moved. Or JP-A-6-169
In the device such as 891, although a part is shared, it is basically only a combination of two devices, so that the whole device becomes large and heavy, and the cost becomes high. was there. Further, since this configuration is based on a stationary measuring device, it cannot be directly applied to a hand-held measuring device.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems in the conventional refractive power measuring device, and aims to measure the refractive power of a lens easily and at low cost without impairing the portability as a hand-held type. It is an object of the present invention to provide a refracting power measuring device capable of performing the following.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems in the conventional refractive power measuring device, the present invention according to the first aspect of the present invention projects measurement light onto an eye to be inspected and the eye to be inspected. An apparatus main body for objectively measuring the refractive power of the eye to be inspected by receiving the measurement light reflected at, and a table for mounting and fixing the apparatus main body, In the refractive power measuring device, a reflecting means for reflecting the measuring light projected on the apparatus main body to the apparatus main body, and an optional lens attached to and detached from the apparatus main body and the reflecting means on the table. And a holding mechanism for holding freely.

[0007] The present invention described in claim 2 provides the present invention.
In the present invention described in the above, the reflection means of the placing table, the optical axis thereof substantially coincides with the optical axis of the device main body, the holding mechanism, the optical axis of the arbitrary lens to the optical axis of the device main body It is characterized in that the arbitrary lens can be freely held so as to be inclined with respect to the lens.

[0008] The present invention according to claim 3 provides the present invention.
Or in the present invention according to 2, the device main body or the table, provided with a detecting means for detecting whether the device body is mounted on the table, the device body, When the detection unit detects that the apparatus main body is mounted on the table, measurement start control unit that performs control for starting refractive power measurement for the arbitrary lens is provided. It is configured as a feature.

[0009]

An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a top view of a refractive power measuring device according to the present embodiment, and FIG.
FIG. 3 is a sectional view taken along the arrow BB ′ in FIG. 1.
In each of these drawings, the present embodiment is composed of a hand-held device main body 1 for objectively measuring the refractive power of the eye to be inspected, and a table 2 for mounting and fixing the device main body 1. A reflector 3 serving as a reflecting means for reflecting the measuring light projected on the apparatus main body 1 to the apparatus main body 1 is provided on the table 2.
And a holding mechanism 5 for holding an arbitrary lens 4.

As shown in FIG. 3 (the broken line of the apparatus main body 1 is omitted in FIG. 3), the refractive power of the eye to be inspected and an optional lens 4 is based on the same principle as in the prior art. And has a housing 11 and a grip 12 attached to a lower portion of the housing 11. Among them, the housing 11
A projection optical system 13 for projecting measurement light to the eye to be examined, a fixation optical system 14 for projecting a fixation target to the eye to be examined, a light receiving optical system 15 for receiving the measurement light reflected by the eye to be examined, and an eye to be examined. Control unit 16 that calculates the refractive power of the lens and controls the start of the measurement of the refractive power of the lens 4 based on the detection result of a detection switch 17 described below, and a control unit 16 that controls the electrical operation of the entire apparatus body 1. A monitor 19 for displaying calculation results and the like in the control unit 16 is provided on the back of the housing 11 (the subject side is the front side and the examiner side is the back side at the time of measurement). Is provided. on the other hand,
At the lower end of the grip 12, a detection switch 17 serving as a detecting means for detecting that the apparatus main body 1 is mounted on the table 2 is provided.

In the projection optical system 13, light emitted from a light source is scanned in a predetermined direction by a chopper through a lens, reflected by a half mirror, and projected on an eye to be examined through a measurement window 11a. In the fixation optical system 14, the fixation target illuminated by the light source is projected on the subject's eye via the lens 4, the half mirror, and the measurement window 11a. The measurement light reflected by the subject's eye passes through the measurement window 11a and the half mirror, and is received by the light receiver 15a via the lens 4 and the aperture. The light receiver 15a outputs a signal corresponding to the amount of the measurement light received by itself, and the controller 16 calculates the refractive power of the eye to be inspected based on the signal.

The detection switch 17 is a push-type switch, and its operation end is disposed so as to protrude downward from the lower surface of the grip 12. Then, when the apparatus main body 1 is placed on the table 2, the working end is pressed by the table 2, thereby detecting that the apparatus main body 1 is placed on the table 2. The detection switch 17 is electrically connected to the start control unit 18, and the detection result is input to the start control unit 18.

On the other hand, the mounting table 2 has a housing mounting portion 21 for mounting the housing 11 of the apparatus main body 1 and a grip mounting portion 22 for mounting the grip 12. The housing mounting portion 21 and the grip mounting portion are provided. The device main body 1 can be held in the same vertical position as that at the time of hand-held measurement via the main body 22 (in general, the state in which the device main body 1 is mounted on the table 2 is hereinafter referred to as a “placed state”). And).

The mounting table 2 is provided with a wall 23 located in front of the apparatus main body 1 in a mounted state, and the above-mentioned reflector 3 is fixed to a side surface of the wall 23 on the apparatus main body 1 side. ing. The reflector 3 is located in front of the measurement window 11a of the apparatus main body 1 in the mounted state, and reflects the measurement light projected from the apparatus main body 1 through the measurement window 11a toward the apparatus main body 1. The measurement light reflected by the reflector 3 enters the apparatus main body 1 through the measurement window 11a, and is received by the light receiver 15a of the light receiving optical system 15 described above. The reflector 3 is particularly arranged at a position and an orientation that makes its optical axis substantially coincide with the optical axis of the apparatus main body 1. The table 2 is provided with a display device and a printing device for outputting the measurement result of the device main body 1 or a charging device for charging the device main body 1 as necessary.

The above-described holding mechanism 5 is provided between the reflector 3 and the measuring window 11a of the apparatus main body 1 in the mounted state. The holding mechanism 5 includes a fixed member 51 and a moving member 5.
2, the fixing member 51 is formed in a short hollow cylindrical shape substantially along the left-right direction of FIG.
It is fixedly provided on the side surface of the wall body 23 of the table 2 on the side of the apparatus main body 1. The internal space 53 of the fixing member 51
The reflector 3 is arranged inside.

The moving member 52 is formed in a thick plate shape, and an opening 54 is formed in the center thereof at a position and a diameter substantially corresponding to the internal space 53 of the fixed member 51. As shown in FIG. 2, a guide member 55 protruding downward is provided at a lower end of the moving member 52, and the guide member 55 is accommodated in a guide groove 24 provided in the placing table 2. Then, the guide member 55 moves inside the guide groove 24.
The moving member 52 slides along
Is slidable in the direction of the arrow (in the direction of the optical axis of the apparatus main body 1). The moving member 52 is constantly urged toward the fixed member 51 by a spring (not shown) provided in the guide groove 24.

The lens 4 is held by the holding mechanism 5 by holding an arbitrary lens 4 between the fixed member 51 and the moving member 52 configured as described above. Here, the arbitrary lens 4 is a lens 4 whose refractive power is to be measured.
And includes both spectacle lenses and contact lenses. Note that a frame groove 25 that opens upward is formed in the wall 23 of the placing table 2. When the lens 4 with the frame is held by the holding mechanism 5, the frame is placed in the frame groove 25. This prevents the frame from interfering with the measurement.

Here, the end of the fixed member 51 on the moving member 52 side and the end of the moving member 52 on the fixed member 51 side are formed to have a curvature substantially corresponding to each other, so that the lens 4 is located between the ends. It is securely pinched. In addition, the end is a holding mechanism 5
Are formed so that the optical axis of the lens 4 held at the position is inclined with respect to the optical axis of the apparatus main body 1. That is, the end does not correspond to the curvature of the lens 4 when the lens 4 is arranged in a state where the optical axis of the lens 4 is aligned with the optical axis of the apparatus main body 1, and the lens 4 is slightly downward. It is formed with an appropriate curvature. Therefore, when the lens 4 is held by the holding mechanism 5, as shown in FIG. 3, the optical axis of the apparatus main body 1 does not coincide with the optical axis of the lens 4, and an angle α is set between the two optical axes. Is formed.

In the present embodiment, the optical axis of the lens 4 held by the holding mechanism 5 is inclined with respect to the optical axis of the apparatus main body 1, and the optical axis of the reflector 3 is set as described above. Since the measurement light projected from the apparatus main body 1 is substantially coincident with the optical axis of the main body 1, the measurement light is reflected by the reflector 3 and enters the apparatus main body, while the measurement light is reflected by the surface of the lens 4. The generated noise light is prevented from being diffused and incident on the apparatus main body 1.

Here, the size and position of the fixing member 51 are fixed, and the curvature of the back surface (the surface on the side of the wall 23) of the lens 4 is substantially constant regardless of the refractive power of the lens 4. The distance between the back surface of the lens 4 fixed by the holding mechanism 5 and the surface of the reflector on the lens 4 side (that is, the distance between the vertices of the lens 4 and the reflector 3) is substantially constant. This distance is stored in advance in a storage unit (not shown) provided in the control unit 16, and the control unit 16 calculates the refractive power based on this distance.

Finally, the operation of the apparatus for measuring the refractive power of the lens 4 will be described. First, the measurement of the refractive power of the eye to be examined is performed in the same manner as in the related art with the apparatus main body 1 removed from the table 2. When measuring the refractive power of the lens 4, first, the lens 4 is held by the holding mechanism 5, and then the apparatus main body 1 is placed on the table 2. At this time, the detection switch 17 detects that the apparatus main body 1 has been placed on the table 2, and
This detection result is output to the start control unit 18.

When the detection switch 17 detects that the apparatus main body 1 has been placed on the table 2, the start control section 18 outputs a control signal for starting measurement to the control section 16 to start measurement. Instruct. The control unit 16 receiving this control signal
Starts the measurement. That is, first, measurement light is projected by the projection optical system 13, and the measurement light is guided to the reflection member via the measurement window 11 a, the opening 54 of the moving member 52, the lens 4, and the internal space 53 of the fixed member 51. The measuring light reflected by the reflecting member is received by a plurality of light receiving elements (not shown) provided on the light receiving device 15a of the light receiving optical system 15 of the measuring device via the reverse path. A signal is sent from this light receiving element to the control unit 1.
6, the control section 16 calculates the refractive power of the lens 4 based on the phase difference between the signals output from the respective light receiving elements and a predetermined distance between vertices. This calculation result is displayed on the monitor 19.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and may be implemented in various forms within the scope of the technical idea. Therefore, these different modes will be described below. First, in the above embodiments, each figure shows a lens with a frame as an object to be measured, but the present apparatus can similarly measure various lenses including a frameless lens and a contact lens. When measuring the contact lens in this manner, if it is difficult to hold the contact lens with the holding mechanism in the above embodiment, an adapter for holding the contact lens is detachably attached to the holding mechanism, or the holding mechanism is used. An adapter for holding a contact lens may be provided instead of the mechanism.

Also, the table is not limited to the one shown in the above embodiment, and any structure that can mount the apparatus body may be adopted. For example, the apparatus main body may be placed horizontally instead of vertically as shown in FIG. Further, the configuration of the holding mechanism is not limited to the configuration shown in the above embodiment, and any well-known holding mechanism may be employed. That is, any lens can be used as long as it can hold an arbitrary lens on the table. If the influence of the surface reflection of the lens on the measurement of the refractive power is negligible, the lens does not necessarily need to be kept inclined.

Although the distance between the vertices has been described as being determined in advance, the distance between the vertices may be adjustable by making the fixing member 51 and the reflector 3 slidable in the directions of the arrows in FIGS. The distance between vertices adjusted as described above may be automatically input to the control unit 16 or may be manually input to calculate the refractive power.

Further, the detecting means is not always necessary. For example, the detecting means may be used as a switch for instructing the start of the refractive power of the eye to be examined, or a hand switch may be separately provided. Further, even when the detection means is provided, it may be provided on a portion other than the grip of the apparatus main body, or may be provided on a table. In the above embodiment, only the measurement of the refractive power of the lens has been described. However, by arranging a simulated eye in place of the reflector, it can be used as a calibration device for calibrating the device body.

[0027]

As described above, according to the first aspect of the present invention, a reflecting means for reflecting the measuring light projected on the apparatus main body to the apparatus main body and an optional lens are provided on the table. By providing a holding mechanism for detachably holding between the main body and the reflection means, the function of the lens meter can be provided to the refractive power device, and the lens meter can be separately purchased and installed. Without measuring the refractive power of the lens. In particular, in the present invention, by providing the holding mechanism fixedly on the table, the portability of the apparatus main body is not impaired, and therefore, the apparatus main body can be easily carried for external sales, group medical examination, and the like. Also, since no attachment / detachment is required, measurement is easy and there is no risk of losing parts. Further, if the holding mechanism is configured not to protrude outward from the table, there is no possibility that the holding mechanism is damaged.

According to a second aspect of the present invention, the reflecting means of the placing table has its optical axis substantially coincident with the optical axis of the apparatus main body.
The holding mechanism can freely hold any lens so that the optical axis of any lens is inclined with respect to the optical axis of the apparatus main body, so that the measurement light projected from the apparatus main body is reflected by the reflector. As a result, the measurement light can be reliably measured because the measurement light is reflected by the lens surface, and the noise light can be prevented from being diffused and incident on the device main body.

According to a third aspect of the present invention, a detecting means for detecting whether or not the apparatus main body is mounted on the mounting stand is provided in the apparatus main body or the mounting table.
When the detection unit detects that the apparatus main body is placed on the table, the start control unit that performs control for starting the measurement of the refractive power of an arbitrary lens is provided. The measurement can be started simply by placing the apparatus main body on the table without manually instructing the start of the measurement, so that the measurement can be performed more easily.

[Brief description of the drawings]

FIG. 1 is a top view of a refractive power measuring device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line A-A 'in FIG.

FIG. 3 is a sectional view taken along the line B-B 'of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 apparatus main body 2 table 3 reflector 4 lens 5 holding mechanism 11 case 12 grip 13 projection optical system 14 fixation optical system 15 light receiving optical system 16 control unit 17 detection switch 18 start control unit 19 monitor 21 housing mounting unit 22 Grip placement part 23 Wall 24 Guide groove 25 Frame groove 51 Fixing member 52 Moving member 53 Internal space 54 Opening 55 Guide member

Claims (3)

[Claims] An apparatus main body for projecting measurement light onto an eye to be inspected and objectively measuring the refractive power of the eye by receiving the measurement light reflected by the eye; and the apparatus. A table for mounting and fixing the main body, a hand-held type refracting power measuring device comprising: a reflecting means for reflecting the measuring light projected on the apparatus main body to the apparatus main body; And a holding mechanism for detachably holding the lens between the apparatus main body and the reflection means. 2. The reflection means of the placing table makes its optical axis substantially coincide with the optical axis of the apparatus main body. The holding mechanism is arranged such that the optical axis of the arbitrary lens is in relation to the optical axis of the apparatus main body. The refractive power measuring device according to claim 1, wherein the arbitrary lens can be held so as to be inclined. 3. The apparatus main body or the placing table is provided with detecting means for detecting whether or not the apparatus main body is placed on the placing table. The apparatus main body includes the apparatus main body. A start control means for performing control for starting a refractive power measurement for the arbitrary lens when the detection means detects that the lens is placed on the table. Item 3. The refractive power measuring device according to Item 1 or 2.