JPH0719999A - Lens meter - Google Patents

Abstract

PURPOSE:To prevent a lens to be checked from being damaged by providing a pressing force quantity adjusting means adjusting the pressing force quantity of a lens pressing means to the lens. CONSTITUTION:The slide shaft 14 of a pressing force quantity adjusting means 9 is lowered via a pinion 12 fitted to a vertically driving motor 11 and a rack 13 while being guided by a linear slide bearing 15a to compress a pressing spring 17. A support piece 16 is also lowered, rubber rollers 22a, 22b fitted to lens press section fitting pieces 16b are brought into contact with a lens to be checked on a lens mount, and they press the lens with the pressing force quantity corresponding to the prism value of the lens. When the prism value is changed, the pressing force quantity is momentarily reduced. The elastic rubber rollers 22a, 22b are rotatably kept in contact with the upper face of the lens, thus the lens is not damaged, and the optical characteristics can be measured without anxiety.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens meter,
More specifically, the present invention relates to a lens meter designed to prevent the subject lens from being damaged.

[0002]

2. Description of the Related Art Generally, a lens meter mounts a lens to be measured on a lens receiver, and presses the lens to be measured by a lens pressing means using a spring that is manually lowered, and uses a measuring optical system and a characteristic determining means. The optical characteristic of the lens to be inspected is measured.

[0003]

However, in the case of the above-mentioned conventional lens meter, the lens pressing means is manually lowered, and the amount of pressing force of the lens pressing means with respect to the lens under test is a spring with a constant biasing force. There is a problem that the lens to be inspected, which is sandwiched between the lens pressing means and the lens receiver, is often scratched because the lens pressing means and the lens receiver are not adjustable. In particular, when the lens to be inspected is frequently moved to measure the optical characteristics of each part of the lens to be inspected, scratches are likely to occur.

Therefore, it is an object of the present invention to provide a lens meter having an improved structure and capable of measuring the optical characteristics in a safe manner without the risk of scratching the lens to be inspected.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a lens to be inspected is mounted on a lens receiver, and the lens to be pressed is used to hold the lens to be inspected to measure the optical characteristics of the lens to be inspected by using a measuring optical system and characteristic determining means. A lens meter for measuring characteristics,
A pressing force amount adjusting unit for adjusting the pressing force amount of the lens pressing unit against the lens to be inspected is provided based on the determination result of the characteristic determining unit.

The pressing force amount adjusting means reduces the pressing force amount of the lens pressing means with respect to the lens to be inspected, based on the result of determination by the characteristic determining means indicating that the lens to be inspected is moving on the lens receiving surface. Is.

Further, the pressing force amount adjusting means brings the lens pressing means into contact with the upper surface of the lens to be inspected, based on the result of determination by the characteristic determining means that the lens to be inspected is placed on the lens receiver. It is a thing.

Further, the lens pressing means is provided with an elastic pressing body which contacts the lens to be inspected and is rotatable in an arbitrary direction.

[0009]

According to the lens meter having the above structure, the lens to be inspected is placed on the lens receiver, the lens to be pressed is pressed by the lens pressing means, and the optical system of the lens to be inspected When measuring the characteristics, the holding force amount adjusting means adjusts the holding force amount of the lens holding means against the lens to be inspected based on the judgment result of the characteristic judging means. As a result, the amount of pressing force of the lens pressing means with respect to the lens to be inspected is adjusted by the optical characteristic of the lens to be inspected, for example, the prism value, etc. Can be measured.

The pressing force amount adjusting means reduces the pressing force amount of the lens pressing means with respect to the lens to be inspected on the basis of the result of determination by the characteristic determining means indicating that the lens to be inspected is moving on the lens receiving surface. Therefore, it is possible to eliminate the risk of scratches when measuring the optical characteristics of each part of the lens to be inspected.

The pressing force amount adjusting means brings the lens pressing means into contact with the upper surface of the lens to be inspected on the basis of the result of determination by the characteristic determining means that the lens to be inspected is placed on the lens receiver. Therefore, the measurement of the optical characteristics of the lens to be inspected can be started quickly.

Further, since the lens pressing means is provided with an elastic pressing body which can be rotated in an arbitrary direction so as to come into contact with the lens to be inspected, the elastic pressing body further surely prevents the lens to be inspected from being scratched. In addition, the movement of the lens to be inspected is facilitated.

[0013]

EXAMPLES Examples of the present invention will be described in detail below.

The lens meter 1 shown in FIG. 1 has a box-shaped casing 2 and a lens receiver 3 arranged on the front surface of the casing 2 in the upper part thereof, and has a light receiving means 42 such as a CCD area sensor therein.
, A light source holder 5 having a built-in measurement light source 41 arranged above the lens receiver 3, and a lens pressing means for pressing the lens L to be inspected installed on the lens receiver 3. The lens retainer 6 and this lens retainer 6
Pressing force amount adjusting means 9 capable of adjusting the pressing force amount to the lens L to be inspected, and LC arranged above the light source holding portion 5.
It is provided with a display unit 7 such as a D display, and an input means 10 arranged on the lower part of the front surface of the housing 2 for giving a measurement start instruction and the like.

A paper discharge port 8 is provided on the side wall of the housing 2.
Is provided.

Here, the lens pressing portion 6 and the pressing force amount adjusting means 9 will be described with reference to FIGS.

The lens pressing portion 6 is arranged so as to be movable up and down with respect to the lens L to be measured by a pressing force amount adjusting means 9.

That is, the pressing force amount adjusting means 9 is provided in the housing 2
A vertical drive motor 11 fixed to the wall surface of the above, a pinion 12 attached to a driving shaft of the vertical drive motor 11, a slide shaft 14 having a rack 13 engaged with the pinion 12 at an upper portion, a linear slide bearing 15a, 1
5b mounted vertically in a vertically arranged upper and lower pieces 16a and a pair of horizontally arranged lens pressing portion mounting pieces 16b that are integrated with the upper and lower pieces 16a, and a support piece 16 and the slide that is inserted into the linear slide bearing 15a. A pressing spring 17 that is wound around the outer periphery of the shaft 14 and applies a vertically downward biasing force to the upper and lower pieces 16a;
and a tension spring 18 for pulling a upward. Incidentally, 19 is a guide shaft which is inserted into the linear slide bearing 15b.

A pair of projecting pieces 21a and 21b forming the lens pressing portion 6 are arranged vertically downward at a predetermined interval on the lens pressing portion mounting piece 16b of the pressing force amount adjusting means 9. A pair of protruding pieces 21a and 21b support a pair of rubber rollers 22a and 22b as elastic pressing members that come into contact with the lens L to be tested so as to be rotatable in arbitrary directions. That is, as also shown in FIG. 4, the roller support 23 is attached to the lower ends of the pair of projecting pieces 21a and 21b so as to be rotatable by 360 degrees, and the rubber rollers 22a and 22b are projected by the roller support 23. The pieces 21a and 21b are rotatably supported in a direction orthogonal to the rotation direction of the pieces 21a and 21b, and thereby the pair of rubber rollers 22a and 22b can be rotated in arbitrary directions.

As shown in FIG. 5, the lens receiver 3 is formed in a substantially cylindrical shape, and the rubber roller 22 is provided at the upper end thereof.
Similar to a and 22b, for example, three rubber rollers 24a, 24b and 24c which can rotate in arbitrary directions are arranged.

FIG. 6 shows a control system of the lens meter 1, which comprises a control unit 31 for controlling the whole and a control means 30 comprising a program memory 32 storing a control program, and the control unit 31. Measuring light source 41
Lighting control of the
A signal processing unit 33 that takes in the output signal of
The input means 10 for giving a measurement start instruction and the like, and the output means 36 including the printer 35 facing the display portion 7 and the paper discharge port 8 are connected.

Further, the control section 31 includes a motor driver 37 for controlling the drive of the vertical drive motor 11, and the optical characteristics of the lens L to be inspected and the lens receiver 3 based on the output signals of the light receiving means 42. The characteristic determining means 40 for determining whether or not the lens L to be tested is present is connected.

Next, the operation of the lens meter 1 will be described.

In this lens meter 1, when the power switch 14a is pressed to turn on the measuring light source 41 and the control system is made operable, the lens L to be inspected is placed on the lens receiver 3. The light flux from the measurement light source 41 passes through the lens L to be measured and is received by the light receiving means 42, whereby the light receiving means 42 sends out an output signal according to the prism value of the lens L to be measured.

The output signal from the light receiving means 42 is signal-processed by the signal processing section 33, and further the control section 31.
Is sent to the characteristic judging means 40 under the control of.

The characteristic judging means 40 judges the optical characteristics such as the prism value, the spherical power, and the axial angle of the lens L to be measured based on the output signal from the light receiving means 42. The prism value is sent to the control unit 31, and the control unit 31 sends a control signal corresponding to the prism value to the motor driver 37 which constitutes the pressing force amount adjusting means 9.

The motor driver 37 drives the vertical drive motor 11 based on a control signal from the control section 31 to determine the lens L to be tested.
The amount of driving depends on the prism value of.

As a result, the slide shaft 14 of the pressing force amount adjusting means 9 descends while being guided by the linear slide bearing 15a via the pinion 12 and the rack 13 attached to the vertical drive motor 11, and the pressing spring 17 is pressed.
Therefore, since the support piece 16 is also lowered,
The pair of rubber rollers 22a and 22b as elastic pressing members attached to the lens pressing portion mounting piece 16b are provided on the lens receiving member 3
The lens L to be inspected is brought into contact therewith, and the lens L is pressed with an amount of pressing force according to the prism value of the lens L to be inspected.

That is, the pressing force amount adjusting means 9 automatically operates the pair of rubber rollers 22a and 22b on the basis of the result of determination by the characteristic determining means 40 that the lens L to be tested is placed on the lens receiver 3. Since the lens L is brought into contact with the upper surface of the lens L, the measurement of the optical characteristics of the lens L can be started quickly.

Further, the pressing force amount corresponding to the prism value acts on the lens L to be tested at this time. When the prism amount changes, the pressing force amount is instantly reduced. Moreover, a pair of elastic rubber rollers 22a and 22b rotatably contact the upper surface of the lens L to be inspected, and the lower surface of the lens L to be inspected includes the three rubber rollers 24a and 24b provided on the lens receiver 3. , 24c are in contact with each other, so that the lens L to be inspected is not damaged, and the optical characteristics can be measured without anxiety.

As described above, with the pair of rubber rollers 22a and 22b in contact with the lens L to be inspected, the lens L to be inspected is moved in any direction on the lens receiver 3, and the optics of each part of the lens L to be inspected are moved. When the characteristic is to be measured, the determination result of the prism value of the lens L to be inspected by the characteristic determining unit 40 automatically changes with the movement of the lens L to be inspected. A control signal corresponding to the change in the value is sent to the motor driver 37 constituting the pressing force amount adjusting means 9 one after another. The motor driver 37 changes the drive amount of the vertical drive motor 11 according to each control signal from the control unit 31.

As a result, the amount of pressing force of the pair of rubber rollers 22a and 22b of the lens pressing portion 6 against the lens L to be measured is adjusted by the optical characteristics of the lens L to be tested, for example, the prism value, and the lens L to be tested is adjusted. Even when moving on the lens receiver 3, it is possible to reliably prevent the lens L to be inspected from being damaged, and at the same time, to measure the optical characteristics with a sense of security.

FIG. 7 shows an example in which instead of the rubber roller 22a of the pressing force amount adjusting means 9, a projecting piece 21a supports a spherical elastic pressing body 45 in which rubber is arranged on the outer periphery of a ball bearing type.

FIG. 8 shows an example in which the rubber roller 24a of the lens receiver 3 is replaced by a ball bearing type spherical elastic pressing body 46 having rubber arranged on the outer periphery thereof.

Even if such elastic pressing members 45 and 46 are used, the same operation as that described above can be exerted.

The present invention is not limited to the above-mentioned embodiments, but various modifications can be made within the scope of the invention.

It is also possible to detect that a lens to be inspected is placed on the lens receiver by a sensor and automatically operate the pressing force amount adjusting means.

It is also possible to interlock a not-shown marking mechanism for marking the lens L to be measured with the operation of the pressing force amount adjusting means.

[0039]

According to the present invention described in detail above, since it has the above-mentioned structure, the following effects can be obtained.

According to the first aspect of the present invention, the amount of pressing force of the lens pressing means against the lens to be tested is adjusted according to the optical characteristics of the lens to be tested, and the lens to be tested may be damaged. Therefore, it is possible to provide a lens meter that can measure optical characteristics without anxiety. Further, by adjusting the amount of pressing force, it becomes easy to move the lens to be inspected.

According to the second aspect of the present invention, it is possible to provide a lens meter capable of eliminating the risk of scratches particularly when measuring the optical characteristics of each portion of the lens to be inspected.

According to the third aspect of the present invention, there is provided a lens meter in which the lens pressing means is automatically brought into contact with the upper surface of the lens to be inspected and the measurement of the optical characteristics of the lens to be inspected can be started quickly. You can

According to the fourth aspect of the present invention, the elastic pressing body provided in the lens pressing means can more surely prevent the lens to be inspected from being scratched, and the lens to be inspected can be easily moved. Can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a lens meter of the present invention.

FIG. 2 is an enlarged perspective view of a lens pressing portion and a pressing force amount adjusting means in this embodiment.

FIG. 3 is an enlarged side view of the lens pressing portion and the pressing force amount adjusting means in this embodiment.

FIG. 4 is an enlarged perspective view showing an elastic roller of the pressing force amount adjusting means in the present embodiment.

FIG. 5 is an enlarged perspective view showing a lens receiver in this embodiment.

FIG. 6 is a block diagram showing a control system of this embodiment.

FIG. 7 is a perspective view showing another example of the lens pressing portion of the present embodiment.

FIG. 8 is a perspective view showing another example of the lens receiver of this embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lens meter 2 Housing 3 Lens receiving 9 Pressing force amount adjusting means 16 Support pieces 22a, 22b Rubber roller 31 Control section 40 Characteristic judging means 41 Measuring light source

Claims (4)

[Claims] 1. A lens meter which mounts a lens to be measured on a lens receiver, presses the lens to be measured by a lens pressing means, and measures optical characteristics of the lens to be measured using a measuring optical system and characteristic judging means. Then, the lens meter is provided with a pressing force amount adjusting means for adjusting the pressing force amount of the lens pressing means with respect to the lens to be tested based on the judgment result of the characteristic judging means. 2. The pressing force amount adjusting means reduces the pressing force amount of the lens pressing means with respect to the lens to be inspected, based on the result of the determination by the characteristic determining means indicating that the lens to be inspected is moving on the lens receiving surface. The lens meter according to claim 1, wherein 3. The pressing force amount adjusting means brings the lens pressing means into contact with the upper surface of the lens to be inspected based on the result of determination by the characteristic determining means that the lens to be inspected is placed on the lens receiver. The lens meter according to claim 1, which is a thing. 4. The lens meter according to claim 1, wherein the lens pressing means is provided with an elastic pressing body that contacts the lens to be inspected and is rotatable in an arbitrary direction.