JPH01305307A - Measuring apparatus for shape of lens or the like - Google Patents

Abstract

PURPOSE:To enable measurement of the shape of a lens for demonstration to be used for a spectacle frame of a wire structure by holding the lens horizontally and by providing a stylus or a holding member thereof moving along the outer peripheral part of the lens. CONSTITUTION:A lens 1 for demonstration is held between a sucking disk 4 of an upper holder 2 and a lower holder 3, and a stylus 17 is brought into contact with the outer peripheral part of the lens 1. Next, a motor 22 rotates according to an instruction of a microcomputer of a control device, a rotary table 18 is thereby made to rotate in the direction H and the stylus 17 rolls while it is in contact with the outer periphery of the lens 1. An angle of rotation of the stylus 17 from a reference point is detected as an angle of rotation of the rotary table 18 by a rotary encoder 25. The displacement in the radial direction of the stylus 17 is detected as an amount of movement of a slide plate 32 by a linear encoder. These data are inputted to an arithmetic circuit and the shape of the lens 1 is thereby determined. By replacing the holder 2, besides, the shape of a flat-plate-shaped template, a spectacle lens in machining or after machined or another optical lens can be measured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shape measuring device for lenses, etc., and more particularly to a shape measuring device for lenses, etc. suitable for measuring the shape of demonstration lenses for eyeglasses.

(Prior art) When processing a lens to match the lens frame of an eyeglass frame, a method of obtaining numerically controlled processing information for the lens is to measure the outer peripheral shape of a flat plate having the same shape as the lens frame. and a method of measuring the shape of the lens fixing groove of the lens frame (for example, Japanese Patent Application Laid-Open No. 62-169008, Japanese Patent Application Laid-open No. 62-169,
[Problems to be Solved by the Invention] However, the desired lens frame has a wire structure made of metal or nylon, and does not have an inner circumferential groove for fixing the lens. In addition, if there is no flat template, the conventional measurement method described above
Unable to obtain lens numerical control processing information.

The present invention has been made in order to eliminate the problems of the prior art described above, and its purpose is to measure the shape of lenses, etc. that can measure the shape of demonstration lenses used in wire-structure eyeglass frames. The purpose is to provide equipment.

[Means for solving problems]

In order to achieve this purpose, the device for measuring the shape of lenses, etc. according to the present invention has a means for holding the lens, etc. almost horizontally at the center from above and below, and a stylus as a measuring point, which is moved along the outer periphery of the lens, etc. means for measuring the horizontal displacement of the stylus or the member holding the stylus from the reference point; and means for measuring the angle of rotation of the stylus or the member holding the stylus from the reference point. It is characterized by the fact that

In this case, the means for holding the lens pancreas are preferably designed to be exchangeable.

〔Example〕

Next, the embodiment of the present invention shown in the figures will be described in detail.

FIG. 1 is a perspective view showing a demonstration lens shape measuring apparatus according to an embodiment of the present invention, and FIG. 2 is a view of the same apparatus as viewed from the direction of the arrow (-). The demonstration lens 1 is attached to a wire-structured eyeglass frame at the frame manufacturing stage.

In this apparatus, the demonstration lens 1 is held in a substantially horizontal state with its convex surface facing upward and its center from above and below. For this purpose, the device comprises an upper holder 2 and a lower holder 3. In this embodiment, the upper holder 2 is provided with a suction IpI4 made of rubber or the like at its lower end, so that the demonstration lens 1 can be held by suction. However, the upper holder 2 may be a mere abutment member that does not function as a suction cup 4. In this case, the abutment member must be provided with a concave abutment surface that approximately matches the convex surface of the demonstration lens l to be held. Preferably, the upper holder 2 is replaceably attached to the lower end of the arm 5 bent at 90 degrees. Although the structure of this attachment is not shown in the drawings, it may be a screw-in type, a fitting type, or some other type. By making the upper holder 2 replaceable, you can prepare a wide variety of upper holders 2 and use it to measure a variety of objects (for example, a flat template manufactured by an eyeglass frame manufacturer to match the shape of each lens frame, [1211 lenses, other optical lenses, etc.] can be held. The arm 5 is 9
Since it is inserted into a stand 6 bent at 0 degrees and fixed with screws 7, it can be attached and detached in the six directions of the arrows. The lower end of the stand 6 is fixed to a stationary part of the measuring device, for example a substrate 8 (see FIG. 2).

As shown in FIG. 3, the lower holder 3 is supported by a support rod 10 via a bearing 9, and is held by a stopper 11 so that it does not come off. Since this support rod lO is urged upward by a spring 13 within the cap 12, the holder 3 is pressed against the demonstration lens 1 from below. The cap 12 functions as a guide and a stopper for the vertical movement of the support rod IO, and is fixed to a mounting plate 14 (see FIG. 4) with screws. This mounting plate 14 is fixed to a covering plate 15 (see FIGS. 1 and 2) of the measuring section, which will be described later.

Next, referring to FIG. 5 and FIG.
6 will be explained. This measuring part is the holder 2 mentioned above.
．． The stylus 17 as a measuring point is moved along the outer periphery of the demonstration lens 1 held by 3, and the radial movement distance and rotation angle of the stylus from the reference point at that time are measured. .

The measurement unit 16 includes a 0-shaped rotary table 18, and this rotary table 18 has a timing pulley 19 attached to its lower surface.
It is rotated in the θ direction by a motor 22 via a timing belt 20 and a timing pulley 21. This rotation angle is connected via a timing belt 23 and a timing pulley 24 to the timing pulley 19 attached to a rotating table 18. is detected by the rotary encoder 25. The motor 22 and the rotary encoder 25 are fixed to the substrate 8 of the measuring device (only a portion is shown in FIGS. 5 and 1 to make it easier to see other parts of the measuring device), and The timing pulley 1
9 and the rotary table 18 are rotatably supported on the substrate 8 by bearings 26 .

The lower holder 3 is arranged on an extension of the center line of the bearing 26.

The rotary table 18 of the measurement section 16 consists of two side plates 27 and 28, and a rectangular central plate 29 connecting the two side plates. The covering plate 15, which is provided with an elongated hole 15a for moving the stylus 17, is fixed to the upper surface of the side plates 27, 28. Two slide guide shafts 30 and 31 are fixed in parallel between the side plates 27 and 28. A horizontal slide plate 32 is slidably guided in the R direction along this slide guide shaft 30,31. For this guidance, the slide plate 32 is provided with three rotatable slide guide rollers 33 and 34 on its lower surface. In this case, one slide guide roller (not shown) contacts one slide guide shaft 30,
Two slide guide rollers 33, 34 are in contact with the other slide guide shaft 31, and these rollers respectively roll along the slide guide shaft so as to sandwich the slide guide shaft 30, 31 from both sides.

A constant force spring (Conston spring) 35 acts on the sliding plate 32 in the sliding direction R, and one side plate 2
It is being pulled towards 7. This spring 35 is wound around a bushing 36 and fixed to the side plate 27 via a shaft 37 and a bracket 38. The other end of the constant force spring 35 is attached to the slide plate 32. The spring 35 has the effect of pressing the stylus 17 against the outer periphery of the demonstration lens 1.

The amount of movement r of the slide plate 32 in the R direction is measured by a reflective linear encoder 39. The linear encoder 39 includes a scale 40 extending between the side plates 27 and 28 of the rotary table 18, a detector 41 fixed to the slide plate 32 and moving along the scale 40, and a preamplifier 4.
2, and a flexible cable 43 that connects the amplifier 42 and the detector 41. The preamplifier 42 is attached to a bracket 44 fixed to the side plate 27.

By moving the slide plate 32 in the R direction, the detector 41 moves while maintaining a constant distance from the surface of the scale 40.

In response to this movement, the detector 4I outputs a pulse signal from the flexible cable 43 to the preamplifier 42. The preamplifier 42 amplifies this signal and sends it to the arithmetic circuit of the control device via a counter.

The slide plate 32 has a stylus 1 as a measuring tip.
7 is retained. The stylus 17 is supported in a sleeve 45 fixed to the slide plate 32 by a sliding bearing so as to be rotatable and movable in the vertical direction. The stylus 17 comes into contact with the outer periphery of the demonstration lens 1 by the action of the constant force spring 35, and is moved along the outer periphery of the demonstration lens 1 by the rotation of the rotary table 18.

At this time, the stylus 17 moves in the radial direction in accordance with the shape of the demonstration lens 1. The amount of movement in the radial direction from the reference point, that is, the amount of movement r in the R direction, is measured by the linear encoder 39 via the sleeve 45 and the slide plate 32, as described above.

Next, the operation of the apparatus for measuring the shape of a lens or the like having the above structure will be explained.

The demonstration lens 1 is attracted to the suction cup 4 of the upper holder 2, and the lower holder 3, which is biased by the spring 13, is pressed from below to hold the demonstration lens 1. Next, the stylus 17 is attached to the demonstration lens 1. It is brought into contact with the outer periphery of the lens 1. When a measurement start switch (not shown) is turned on, the morph 22 rotates according to instructions from the microcontroller of the control device, and the rotating table 18 connected by the timing belt 20 rotates at θ
The stylus 17 moves in contact with the outer periphery of the demonstration lens 1 (see FIG. 6).

The rotation angle (θ) of the stylus 17 from the reference point is detected by the rotary encoder 25 as the rotation angle of the rotary table 18. As described above, the radial displacement r of the stylus 17 is detected by the linear encoder 39 as the amount of movement of the slide plate 32 in the R direction. These data (θ, r) are:

The data is input to an arithmetic circuit (not shown), and the shape of the demonstration lens 1 is determined.

In the case of the above embodiment, by replacing the upper holder 2, the flat template, the [Iff,
The shape of Iff lenses and other optical lenses can be measured.

The reference point during the measurement can be arbitrarily determined.

(Effects of the Invention) As described above, the device for measuring the shape of a lens, etc. according to the present invention holds the center of the lens, etc. almost horizontally from above and below, and uses a stylus or stylus that moves along the outer periphery of the lens, etc. Since the horizontal displacement and rotation angle of the holding member from the reference point are measured, it is possible to measure the shape of the demonstration lens, which was previously impossible. Furthermore, since the holding means for lenses and the like is formed to be replaceable, the shapes of flat templates, spectacle lenses, other optical lenses, etc. can be measured.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a demonstration lens shape measuring device according to an embodiment of the present invention, Fig. 2 is a view of the same device as seen from the direction of the arrow ■, and Fig. 3 is a cross-sectional view of a portion of the lower holder. , FIG. 4 is a bottom view of the mounting plate of a portion of the lower holder, FIG. 5 is a perspective view of the measuring mechanism, and FIG. 6 is a partial plan view of the measuring mechanism showing the measuring state. 1... Demonstration lens, 2... Upper holder, 3
...lower holder, 4...suction cup, 5...arm, 6...stand, 7...screw, 8'.
... Board, 9... Bearing, 10... Support rod,
11... Stopper, 12... Cap,
13... Spring, 14... Mounting plate, 15...
・Covering plate, 15a...hole, 16...measuring part,
17... Stylus, 18... Turntable,
19.21.24...Quiming pulley, 20.
23...Timing belt, 22...Morph,
25... Rotary encoder, 26... Bearing, 27. 28... Side plate, 29... Center plate, 30.
31...Slide guide shaft, 32...Slide plate, 33.34...Slide guide shaft °-
35... Constant force spring, 36... Bushing, 37... Shaft, 38... Bracket,
39... Linear encoder, 40... Scale, 41... Detector, 42... Preamplifier, 4
3...Flexible cable, 44...Bracket, 45...Sleeve, A, R, θ...Arrow,
Applicant Hoya Co., Ltd. Agent Patent Attorney Shizuo Nakamura Figure 6

Claims (1)

[Scope of Claims] 1. Means for holding a lens, etc. approximately horizontally at the center from above and below; A means for moving a stylus as a probe along the outer periphery of the lens, etc.; A stylus or a member for holding the stylus; , a shape of a lens, etc., characterized in that it is equipped with means for measuring horizontal displacement from a reference point, and means for measuring a rotation angle from a reference point of a stylus or a member holding the stylus. measuring device. 2. The device for measuring the shape of a lens or the like according to claim 1, wherein the means for holding the lens or the like is formed to be replaceable.