JPS6333155Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a lens meter that measures the spherical power, cylinder power, cylinder axis angle, and prism power of eyeglass lenses.

This type of lensmeter includes a telephoto lensmeter in which the main optical system is arranged in a straight line and the lower part of the main body that holds the optical system is used as a tabletop, and a projection type lensmeter in which the observation section of the chart uses an enlarged projection system. Both are designed to be used on a tabletop.

The problems and drawbacks of these conventional techniques are that they are large and heavy, which makes it inconvenient to travel from an optical store to sell and measure them, and that they cannot be used in stores unless they are installed in the store. Because each operating member is arranged, it may not be possible to operate each member such as the eyeglass lens while lifting the main body with one hand.

This device was designed to eliminate the above-mentioned drawbacks, and was filed in the U.S. Pat.
In the optical system disclosed in No. 23821, in which the optical axis is bent using a reflective member, the handle and other members are placed in a position where it is easy to operate with both hands in a small space. The purpose of the present invention is to provide a light lens meter that is lightweight, easy to carry, and enables hand-held operation.

This will be explained below using the drawings.

FIG. 1 shows the main parts of a conventional telephoto lensmeter, which consists of a light source 1, an optotype 2, an objective lens 3, a relay lens 4, a focus plate 5, It consists of an optical system in which eyepiece lenses 6 are arranged in a straight line, and a test lens 8 is pressed and held on a lens holder 7 between an objective lens 3 and a relay lens 4 by a lens holder 9 biased by a spring. . A power dial 11 that is interlocked to slide the optotype 2 in the optical axis direction and a contact plate knob 13 that drives a lens contact plate 12 for supporting the lens 8 to be examined protrude from the side surface of the main body 10. . Further, although not shown, a power reading optical system for reading a power scale linked to the optotype 2 using the eyepiece 6 is built into the main body 10.

The function and operating procedure of this conventional example will be explained.

First, lift the lens holder lever 14 that is integrated with the lens holder 9, sandwich the lens 8 between the lens holder 7 and the lens holder 9, turn the contact plate knob 13, and move the lens holder 12 to the edge of the lens 8 to be tested. Hold it against the Next, the power dial 11 is turned to move the optotype 2 back and forth, and its image is focused on the focusing plate 5. At that time, the power scale and the shape of the image of the optotype 2 are measured through the eyepiece 6.
The power, cylinder axis angle, and prism power of the lens 8 to be tested are measured.

As mentioned above, the main optical system of the conventional lens meter mentioned above is a straight cylinder type, and the optical system for reading the power is also built-in, and each operating member cannot be operated with the main body lifted, and it is large. It has the disadvantage of being heavy and not very portable, making it difficult to hold it in hand. Further, the projection type lens meter also has the same drawbacks because the image is enlarged by taking a long optical path from the relay lens 4 to the focus plate 5.

Examples of this invention will be described below.

FIG. 2 is a side sectional view of an embodiment of the present invention,
Figure 3 is a top external view, Figure 4 is a side external view,
FIG. 5 is a side view during operation.

In the above diagram, the main parts of the optical system from the optotype 2 to the eyepiece 6 are the same as those described in the above-mentioned application by the present applicant.
No. 55-23821.

That is, the following members are arranged on the optical axis along the traveling direction of light to form the optical path to be detected. It consists of an optotype 2 with a chart formed on its surface, an objective lens 3, a prism 15, a lens holder 7, a test lens 8, a relay lens 4, a first mirror 16, a second mirror 17, a focus plate 5, and an eyepiece lens 6. It is.

The optotype 2 is fixed to one end of a slider 18 that is slidably fitted to the main body 10 in the optical axis direction. The optical axis is bent at a right angle by the prism 15, further bent by the first mirror 16 in a direction substantially parallel to the optical axis formed by the optotype 2 and the objective lens 3, and
7 in a direction adjacent to the first mirror 16 and reaches the eyepiece lens 6. The optical axes reflected three times are on the same plane. Behind visual target 2,
The light source 1 is fixed to the slider 18, and the visual target 2
is lighting.

A slider 18 is fitted into the main body 10, and includes an objective lens 3, a prism 15, a relay lens 4, and a first
A mirror 16, a second mirror 17, a focusing plate 5, and an eyepiece 6 are fixed inside, and the vicinity of the lens to be tested 8 is a space, and the main body 1 is placed in this space.
A lens holder 7 protrudes from the side surface of 0. Further, a handle portion 10a is formed integrally with the main body at a position below the space portion and enclosing the sliding portion of the slider 18. That is, the main body 10 is approximately Y-shaped, and has an objective lens 3 and a prism 15 on one side of the upper forked part, and a relay lens 4 on the other side.
The optical system from the fork to the eyepiece 6 is built in, and the lens holder 7 and the test lens 8 in contact with it are located in the central space of the fork, and the lower part where the fork joins becomes the handle part 10a, and the slider It has 18 built-in. A battery 19 is located in the side hollow part of the slider 18 in the handle part 10a, and is connected to the light source 1 (wiring is not shown). A rack portion 18a is formed on the side surface of the slider 18, and meshes with a pinion 20 rotatably supported by the handle portion 10a. A power dial 11 is connected to the pinion 20 and protrudes from the side surface of the handle 10a, and a scale indicating the power of the tested lens 8 is engraved on the outer periphery of the power dial 11 and displayed on the handle 10a. It faces indicator 21.

Next, the holding mechanism of the lens 8 to be tested will be explained. Inside the main body 10, a lens holder 9 is attached to a side surface of the optical system so as to be slidable in a direction parallel to the optical axis within the lens holder 7. One end of the lens holder 9 protrudes from the relay lens 4 toward the lens holder 7, and the other end is attached to the slider 1 on the upper part of the handle 10a.
A finger pressing portion 9a is formed by protruding from the 8 side.

A chip 22 made of an elastic material is fixed to a position of the lens holder 9 facing the lens 8 to be tested to prevent the lens 8 to be tested from being scratched.

Furthermore, a spring 23 is installed inside the main body 10,
Spring locking portion 9b integrally formed with lens holder 9
By engaging with and urging the lens holder 9 toward the lens holder 7, the lens 8 to be tested is held on the lens holder 7.

Next, a description will be given of the relationship between the lens abutting plate 12, which is slidably provided in the space in a direction perpendicular to the optical axis of the lens to be tested, in order to hold the edge of the lens to be tested 8. Two band-shaped slide protrusions 10b are formed on the outer side surface of the main body 10 near the objective lens 3 in a direction parallel to the optical axis. The lens contact plate 12 has a long and narrow plate shape with a length close to twice the interpupillary distance of a general eyeglass lens, and has a U-shaped mounting portion 12a in the center.
A groove is formed inside the mounting portion 12a and is fitted with the slide protrusion 10b. Lens contact plate 12
protrudes perpendicularly to the main body 10 and is located below the lens 8 to be tested.

Hereinafter, the operating procedure and operation of this lens meter will be explained with reference to FIGS. 2 to 5.

(1) Grasp the handle 10a with your left hand with the eyepiece 6 facing forward.

(2) Push the finger pressing part 9a against the spring 23 with the index finger of the left hand to lift the lens holder 9.

(3) Hold the lens 8 to be tested with your right hand and place the lens holder 7 so that the temple of the glasses is on the opposite side of the eyepiece 6.
Place the lens on top, loosen the index finger of your left hand, and press lens holder 9.
Press down on the lens 8 to be tested.

(4) Slide the mounting portion 12a of the lens abutment plate 12 with your right hand, and support the lens abutment plate 12 against the edge of the lens 8 to be tested.

(5) Turn the power dial 11 with your right hand to move the optotype 2 and form its image on the focusing plate 5.

(6) Read the spherical power and cylinder power of the test lens 8 from the scale on the power dial 11, and read the cylinder axis angle and prism power from the image within the field of view seen through the eyepiece lens 6.

In this way, use your left hand to support the device and the lens holder 9.
, insert the lens 8 to be tested, slide the lens abutment plate 12, and rotate the power dial 11 with the right hand, and observe the image through the eyepiece 6.

As explained above, the present invention is small and lightweight, so it is easy to carry and can be used anywhere, even when visiting an optician for measurements or inside the store. By appropriately arranging the device, measurements can be carried out in the hand, without the need for a desk or the like, and the measurement can be carried out in a natural position, including the hands and face.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the main parts of a conventional telephoto lensmeter. Figures 2 to 5 are top views of one embodiment of this invention, Figure 2 is a side sectional view, Figure 3 is a top external view, Figure 4 is a side external view, and Figure 5 is a side view. It is a side view at the time of the operation. 1: Light source, 2: Visual target, 6: Eyepiece, 7: Lens holder, 8: Test lens, 9: Lens holder, 1
0: Main body, 11: Power dial, 12: Lens contact plate, 15: Prism, 16: First mirror, 17:
2nd mirror, 18: slider, 19: battery, 2
3: Spring.

Claims (1)

[Scope of claim for utility model registration] The light emitted from the light source is transmitted to the target, objective lens, prism, test lens, in order from the optotype side.
A lens meter having a test optical path passing through a relay lens, a reflecting mirror, a focusing plate, and an eyepiece, the lens meter body having a lower part as a handshake part and an upper part as a forked part with a space between them, One of the forked parts has a built-in optical system consisting of the relay lens, a reflecting mirror, a focusing plate, and an eyepiece, and the other of the forked parts has an optical system consisting of a light source, a target, an objective lens, and a prism. All or part of the lens holder is built-in, and a lens holder for receiving the lens to be tested is provided to protrude toward the space side, and one end protrudes from one side of the forked portion opposite to the lens holder. When the other end protrudes above the handshake part, and the one end is normally biased by a spring in the direction of pressing the lens to be tested against the lens abutment base, and the other end is pushed against the spring biasing force. is slidably provided with a lens holder whose one end is separated from the lens abutment base, and the lens abutment plate that holds the edge of the test lens is slid in the direction perpendicular to the optical axis of the test lens within the space. A hand-held lens meter that is characterized by being freely movable.