JPH04190130A - Lens eccentricity measuring device - Google Patents

Abstract

PURPOSE:To accelerate the shortening of a measuring time and efficiency and to measure eccentricity with high accuracy by relatively moving a lens to be measured in the direction almost crossing an optical axis at a right angle with respect to a projection optical system to display the relative moving quantity of said lens. CONSTITUTION:The focus of a projection optical system 1 is controlled and the image 93 of a chart 4 is formed on a screen 21 and an X-Y table 40 is moved by moving devices 50a, 50b to move a lens 30 to be measured and the image 93 is guided to the intersecting point 0 of an X-axis and a Y-axis and a digital gauge 60a is reset to 0. Next, in such a case that the lens 30 is eccentric with respect to a rotary shaft when the lens 30 is rotated by 180 deg. by a finger, the image 93 also draws a circular arc to be shifted from the point O and the handles 54 of the moving devices 5Oa, 50b are rotated forwardly or reversely so that the image 93 is returned to the point O to coincide therewith and, at this time, each moving quantity of the spindle part 61 of the gauge 60a of each of the X-axis and the Y-axis cooperated with the Y-table is operated and displayed. An observer can directly measure the eccentricity quantity of the lens 30 on the basis of a displayed numerical value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lens eccentricity measuring device for measuring the eccentricity of an optical lens caused by centering errors, bonding errors, and the like.

[Conventional technology]

FIG. 10 is a schematic diagram showing the structure of a conventional lens eccentricity measuring device.

100 is a light projection optical system for projecting light onto the lens 118 to be measured. The projection optical system 100 includes a light source lamp 101, a condenser lens 102, a chart 104, and an imaging lens 108.

120 is an observation optical system for observing the reflected light from the lens 118 to be measured. The observation optical system 120 includes an imaging lens 108, a beam splitter 106, a screen 110, and an eyepiece 112.

On the surface of the screen 110, an X-axis and a Y-axis are drawn on a predetermined scale so as to be perpendicular to each other (see FIGS. 68 to 6C).

+30 is a holder called a bell for centering the lens to be measured 118, and supports the lens to be measured 11g placed with the surface to be measured 115 facing upward, and rotates the lens around the central axis 122 as a rotation axis. It has a structure that rotates together with the measurement lens 118, and here the optical axis 12 of the projection optical system +00 is rotated.
3 and the central axis 122 of the holder 130 are set to substantially coincide with each other.

This kind of lens eccentricity measuring device has a central axis 1 of holder +30.
This is for measuring the amount of deviation of the center of curvature of the surface to be measured 115 with respect to 22.

The chart 104 is illuminated from behind by the light source lamp 101 through the condenser lens 102 .

The light emitted from the chart 104 is transmitted through the imaging lens 1
08, and chart 1 is imaged at the image point 116.
Make a statue of 04.

Therefore, if adjustment is made so that the position of this image point 116 almost coincides with the position of the center of curvature of the surface to be measured II5, the light ray passing through the image point 116 will be incident on the surface to be measured 115 almost perpendicularly, so-called It enters autocollimation state.

In such an autocollimation state, the surface to be measured 1
The light reflected at 15 again forms an image of chart 104 near the position of image point 116.

The reflected light that formed the image of the char h104 passes through the imaging lens 108 again, is reflected by the beam splitter 106, and converges toward the screen 110. Since this screen 110 is placed at a mirror image position of the charts 1-104 with respect to the reflective surface of the beam splitter 106, the image of the chart 104 is again formed on this screen 110.

At this time, when the center of curvature of the surface to be measured 115 is on the central axis 122 of the holder 130 (rotation axis of the holder 130), that is, when the surface to be measured 115 is on the central axis 122 of the holder 130,
When the lens to be measured 118 is not eccentric with respect to
Even if the screen 1 is rotated together with the holder 130,
The image of chart 104 on top 10 is stationary.

However, the surface to be measured 115 is located at the central axis 122 of the holder 130
When the image of the chart 104 is decentered with respect to the screen 110, the inclination direction of the surface to be measured 115 changes as the lens to be measured 118 rotates, so the image of the chart 104 moves in a circular manner on the screen 110.

Therefore, the observer rotates the holder +30 without observing the image of the chart I04 on the screen 110 seen through the eyepiece 112, and the image of the chart I04 at this time is
Based on the movement of the image, it can be determined whether the lens to be measured 118 is decentered.

In other words, when the lens to be measured 118 is rotated together with the holder 130, the image of the chart 104 is displayed on the screen 1.
If the lens 10 moves in a circular manner, the amount of eccentricity of the lens 118 to be measured can be measured by reading the size of the circle on the scale of the screen 110.

[Problem to be solved by the invention]

When the lens to be measured 118 is rotated together with the holder 130, the size of the circle drawn by the image of the chart 104 on the screen 110 is proportional to the eccentricity of the lens to be measured l18, but is not necessarily equal to it. Chart 10
After reading the size of the circle drawn by the image of 4 on the screen +10 using the scale of screen 1]0, the amount of eccentricity of the lens 118 to be measured can only be found by multiplying the read scale number by a proportionality constant. can.

Here, the amount of eccentricity of the lens to be measured 118 is defined as follows. That is, the diameter of the circle drawn by the center of curvature of the surface to be measured 115 when the lens to be measured 118 is rotated integrally with the holder 130 with the center axis 122 of the holder 130 as the rotation axis is the diameter of the circle to be measured. Let it be the amount of eccentricity.

When the eccentricity of the lens to be measured 118 is defined in this way,
A proportionality constant for converting the number of graduations on the screen 110 into the amount of eccentricity of the lens 118 to be measured can be expressed as n/(2m). Here, the constant 2 is the central axis 12 of the holder 130.
2 as the rotation axis, and when the lens 118 to be measured is rotated together with the holder 130, the center of curvature of the surface to be measured 115 moves in a circle, and the light is incident on the surface to be measured 115 in an auto-collimated state. The image of the chart 104 caused by the reflected light also moves in a circle, and the image of the chart 104 is equal to the diameter of the drawn circle or the eccentricity of the lens 118 to be measured.
This is the value for double.

Also, m is the magnification of the imaging lens 108, and the surface to be measured 11
This value indicates how many times the size of the image of the chart 104 formed on the screen 110 is compared to the size of the image of the chart 104 caused by the light incident on the screen 5 in an autocollimated state and reflected. and n is screen 1
This is the distance per scale on the scale above 10.

Therefore, the actual amount of eccentricity of the lens 118 to be measured is the value obtained by multiplying the size of the circle drawn on the image of the chart 104 or the screen 110 by the number of scales read by the scale of the screen 110 by n/(2m). For example, as shown in FIG. 11, the diameter of the circle A drawn by the image of the chart 104 on the screen 110 is 8 scales, and in this case, the magnification of the imaging lens 108 is m=10 (times). distance n-
Assuming 0°1, (mm), the amount of eccentricity in this case is 8×
0°1/(2x 1.0)=0.04+r++n.

I7However, among the above proportionality constant n/(2m), the magnification m of the imaging lens 108 is not always constant.

In the case of a lens eccentricity measuring instrument as shown in FIG. 10, the imaging lens 108 is
It is necessary to move the image position +16 of the chart lo4 along the optical axis 123 (hereinafter this will be referred to as focus adjustment).

One method is to move the chart 104 and the imaging lens 108 relatively along the optical axis 123.

This method allows focusing on the surface to be measured 115 having a relatively wide range of curvature radius with a relatively small amount of movement between the chart 104 and the imaging lens 108;
This also leads to the result that the imaging magnification m of the 08 lens changes depending on the focus adjustment.

Therefore, with conventional lens eccentricity measuring instruments, the lens to be measured 1
Focus adjustment conditions (chart 104 and optical axis 12 of imaging lens 108)
3) and the corresponding imaging magnification m of the imaging lens 108 are determined in advance. Based on this, the radius of curvature of the surface to be measured 115 and the constant of proportionality 07 (
2m) was prepared and used to determine the amount of eccentricity of the lens 118 to be measured.

In this manner, the conventional lens eccentricity measuring instrument performs a focus adjustment that is predetermined according to the radius of curvature of the surface to be measured 115 of the lens to be measured 118, and
8, the chart 104 appears on the screen 110.
The eccentricity of the lens to be measured 118 is calculated by reading the diameter of the circle drawn by the image using the scales on the screen 110 and comparing the number of scales read with the correspondence table described above. Measurement took a long time.

Furthermore, since the scale on the screen 110 is recognized visually, there are many reading errors, which has the disadvantage of lacking measurement accuracy.

The present invention eliminates such conventional drawbacks, makes it possible to directly read the amount of eccentricity of a lens to be measured, shortens the time and efficiency of eccentricity measurement work, and enables highly accurate eccentricity measurement. The purpose of this invention is to provide an eccentricity measuring device that can be used to measure eccentricity.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a lens eccentricity measuring instrument having a projection optical system that projects an aiming light source toward a lens to be measured, in which the lens to be measured is positioned substantially orthogonal to the optical axis of the lens to be measured. and a movement amount display means for displaying the relative movement amount of the lens to be measured. do.

〔Example〕

Examples will be described with reference to the drawings.

FIG. 1 is a schematic front view of a lens eccentricity measuring instrument showing a first embodiment of the present invention.

3 is a light projecting optical system for projecting an aiming light source onto the lens to be measured 3G, which includes a light source lamp 2, a condenser lens 3, a chart 4, and a beam splitter 5 arranged sequentially on the optical axis IO. , and an imaging lens 8 that is vertically movable.

As a result, the light from the light source lamp 2 is converged onto the chart 4 through the condenser lens 3 and becomes a aiming light source 90. Then, the light beam from the aiming light source 90 passes through the beam splitter 5 and is formed into an image 9 of the chart 4 by the imaging lens 8.
Image 1. Further, the light beam from this image 91 is reflected by the surface to be measured 36, and the light beam from the image 91 is reflected on the chart 4 near the position of the image 91.
An image 92 is formed.

Therefore, when the center of curvature of the surface to be measured 36 is located on a plane that includes the point image 91 formed by the imaging lens 8 and is perpendicular to the optical axis lO, the reflected image 9 of the reflected light from the surface to be measured 36
2 is imaged on the plane, resulting in a so-called autocollimation state.

Reference numeral 20 denotes an observation optical system for observing this reflected image 92, which is composed of an imaging lens 8, a beam splitter 5, a screen 21 for projecting an image 93 of the reflected image 92, and an eyepiece 22. ing. Note that the distances m and n are set equal.

The lens to be measured 30 is placed on a holder 31 provided on an XX table 40.

The X-X table 40 includes an X table 43 and an X table 44 that are sequentially stacked on a fixed part 42 fixed on a base 41.
It is composed of.

The X table 43 is formed of a rectangular plate-like body, and has a convex rail portion 43a at the center of its upper surface, and a concave dovetail groove 43b facing perpendicular to the convex rail portion 43a at the center of its lower surface.
are formed respectively.

The dovetail groove 43b of the X table 43 is slidably fitted into a convex rail portion 42a formed on the upper surface of the fixing portion 42.

The X-table 44 is also formed of a rectangular plate-like body, and a dovetail groove 44b into which the rail portion 43a of the X-table 43 is slidably fitted is formed in the center of the lower surface thereof.

In this way, the X table 43 can move along the rail portion 42a of the fixed part 42 on the X axis indicated by the dashed line in FIG.
It is possible to move along the rail portion 43a of No. 3 on the X axis indicated by the dashed line in FIG. Note that when the X table 43 is moved, the X table 44 is also moved together.

Furthermore, as shown in FIG. 2, three holders 31 arranged in a substantially Y shape are fixed to the upper surface of the X table 44 by screws.

A lens to be measured 30 is placed on the upper end of these holders 31.
is listed.

As shown in a cross-sectional view in FIG. 3A, each of the three holders 31 includes a protrusion 33 that receives the polished surface 32 on the lower side of the lens 30 to be measured, and a presser that presses the outer periphery 34 of the lens 30 to be measured from the outside. I have part 35. As shown in FIG. 2, the relative distances between the three holders 31 are adjusted so that the outer periphery 34 of the lens 30 to be measured is just in contact with three positions of the holding portions 35 of the three holders 31, and the lens 30 is fixed. has been done.

Note that each of the holders 31 may have a chip-shaped projection 33a and a chip-shaped holding part 35a as shown in a cross-sectional view in FIG. 3B.

When supporting the lens 30 to be measured with such a holder 3 and measuring the eccentricity of the lens 30, rotate the lens 30 to be measured in the fixed holder 31 with your finger or the like, and measure the current position. The amount of deviation of the center of curvature of the surface to be measured 36 with respect to the rotation axis is measured.

That is, the diameter of the circle drawn by the center of curvature of the surface to be measured 36 when the lens to be measured 30 is rotated in the holder 31 is defined as the amount of eccentricity of the lens to be measured 30, and the first step is to measure this amount. This is the purpose of the lens eccentricity measuring instrument shown in the figure.

In FIG. 1, 50a and 50b are movers (moving means) for moving the X table 43 and the X table 44, respectively.

Specifically, as shown in FIG.
A coaxial female screw portion 51a and a hole 51b are formed, a male screw portion 53a of the spindle portion 53 is screwed into the female screw portion 51a, and a tip portion 53b of the spindle portion 53 is loosely fitted into the hole 51b. Then, the head section 52 integrated with the spindle section 53 is rotatably and slidably fitted to the tip of the support section 51, so that the movers 50a, 50b
or is formed. 54 is a handle for rotating the head portion 52.

The mover 50a, as shown in FIGS. 1 and 2,
By bringing the tip of the spindle part 53 into contact with the right side surface of the X table 43 to arrange the spindle part 53 on the X axis, and by fixing the base end part of the support part 51 to the right side surface of the fixing part 42, It is attached to the side of 42.

The mover 50b places the spindle part 53 on the X axis by bringing the tip of the spindle part 53 into contact with the front side of the Y table 44 (bottom side in FIG. 2), and also aligns the base end of the support part 51 with the
It is attached to the front part of the X table 43 by being fixed to the front side of the table 43.

Therefore, when the handle 54 of the mover 50a is rotated in the forward direction, the male threaded portion 53a of the spindle portion 53 is rotated against the support portion 51.
The spindle part 53 pushes the X table 43 with its tip and moves it to the left in the X-axis direction.

Further, when the handle 54 is rotated in the opposite direction, the tension spring table 43 (not shown) is pulled to the right in the X-axis direction and moved to the right.

Similarly, when the handle 54 of the mover 50b is rotated in the forward direction, the spindle part 53 pushes the Y table 44 with its tip and moves it to the rear side in the y-axis direction (upper side in FIG. 2).

Furthermore, when the handle 54 is rotated in the opposite direction, a tension spring (not shown) pulls the Y table 44 forward in the y-axis direction, causing it to move forward.

In FIG. 2, 60a and 60b are movers 50a.

This is an electric digital gauge (movement amount display means) for displaying the amount of movement of the Y table 44 by the Y table 50b.

Specifically, as shown in FIG. 5, the digital gauges 60a and 60b are mounted on the front stage so as to be slidable in the direction of the arrow, and are biased in the projecting direction by a spring (not shown). And this spindle part 61
It has a conversion circuit 62 that converts the amount of movement into an electrical signal.

In the latter stage, there is provided a drive circuit 63 that calculates the amount of movement of the spindle section 61 based on the electric signal from the conversion circuit 62, and a display 64 that digitally displays the amount of movement calculated based on the command of the drive circuit 63. ing. 66
is a celery cent button for resetting the display on the display 64 to celery.

As shown in FIGS. 1 and 2, the spindle portion 61 of the digital gauge 60a is arranged on the X-axis with the tip thereof in contact with the left side surface of the Y table 44. A base end portion of the spindle portion 61 is supported by a support body 51 erected on the base 41.

The spindle portion 61 of the digital gauge 60b is disposed on the X-axis with the tip thereof in contact with the rear surface (second father) of the Y table 44. A base end portion of the spindle portion 61 is supported by a support body 51 erected on the base 41.

Therefore, when the handle 54 of the mover 50a is rotated in the forward direction, the pressing force of the Y table 44, which moves in the left direction of the X axis together with the Move to the main body side. And the spindle part 61
The amount of movement is displayed as a positive value on the display 64 via the conversion circuit 62 and the drive circuit 63.

Furthermore, when the handle 54 is rotated in the opposite direction, the Y table 44 moves in the X-axis direction together with the X table 43, and the spindle part 61 moves in its protruding direction due to the biasing force of the spring part, and the amount of movement is reflected in the display 64. Displayed as a negative number.

Similarly, when the handle 54 of the mover 50b is rotated in the forward direction, the spindle part 61 of the digital gauge 60b receives the pressing force of the Y table 44 that moves rearward in the y-axis direction, and the spindle part 61 is connected to the main body side of the digital gauge 60b. Move to. Then, the amount of movement of the spindle section 61 is displayed as a positive value on the display 64 via the conversion circuit 62 and the drive circuit 63.

Also, when the handle 54 is rotated in the opposite direction, the X
The table 44 moves, the spindle part 61 moves in its protruding direction due to the biasing force of the spring part, and the amount of movement is displayed on the display 64 as a negative value.

Next, a method for measuring the amount of eccentricity using the lens eccentricity measuring device of this embodiment will be explained.

First, as shown in FIG. 1, the focus of the light projection optical system l is adjusted so that the light emitted from the aiming light source 90 of the chart 4 enters the measured surface 36 of the measured lens 30 in an auto-collimated state. The image 93 of the chart 4 is formed on the screen 21. And the mover 50a,
50b, the X-Y table 40 is moved to move the lens 30 to be measured, and as shown in FIG. 6A, the image 93 is
is guided to the intersection O of the X-axis and Y-axis of the screen 21.

At this point, the user presses the zero reset button 66 on the digital gauges 60a, 60b to reset the display 64 to zero display.

When the lens 30 to be measured in the holder 31 is rotated 180 degrees with a finger or the like from this state, if the lens 30 to be measured is eccentric with respect to the rotation axis at that time, the screen 21 will be rotated as shown in FIG. 6B. The image 93 also rotates by 180° in a circular arc and deviates from the zero point.

Next, as shown in FIG. 6C, the movers 50a, 50
b is used to return the image 93 that has shifted from the 0 point to the 0 point.

That is, the X-table 43 is moved by rotating the handle 54 of the mover 50a forward or backward.

This X-table 43 moves on the X-axis shown by the dashed line in FIG. It also moves on the X-axis in a direction perpendicular to the optical axis lO. Then, the image 93 on the screen 21
moves parallel to the X-axis of the screen 21, so by appropriately operating the mover 50a, the screen 21
The upper image 93 can be moved closer to the Y axis.

When the image 93 comes near the Y-axis of the screen 21, the mover 50a is stopped, and then the knob 54 of the mover 50b is rotated in the forward or reverse direction. Since it moves on the X axis along
The lens to be measured 30 moves together with the X table 44 on the X axis in the direction perpendicular to the optical axis lO. Then screen 2
Since the image 93 on the screen 21 moves parallel to the Y axis of the screen 21, the image 93 on the screen 21 can be moved closer to the X axis by appropriately operating the mover 50b.

While looking at the image 93 on the screen 21, the movers 50a and 50b are operated as described above, and the image 93 is gradually brought closer to the 0 point to coincide with it.

At this time, the spindle portions 61, 61 of the digital gauges 60a, 60b move following the movement of the X table 44, so that the amount of movement of the spindle portions 61, 61 in the is calculated and displayed as an integrated value on the display 64.

Therefore, the observer can read the digital gauges 60a, 60a, 60a, 60a, 60a.
By reading the numerical values displayed on the display 64.64 of 0b, it is possible to directly measure the respective components of the eccentricity in the X-axis direction and the Y-axis direction of the lens 30 to be measured with respect to the rotation axis in the holder 31. can. Further, if the square root of the sum of the squares of the numerical values displayed on the two displays 64 and 64 of the digital cages 60a and 60b is calculated, it becomes the absolute value of the eccentricity of the lens 30 to be measured.

For example, when the movers 50a and 50b are operated as described above and the image 93 is gradually brought closer to the zero point and coincident with each other, the second
Assuming that the display shown in the figure is displayed, the display 64 of the digital gauge 60a shows that the lens 30 to be measured is eccentric by 0.456 mm in the X-axis direction with respect to the rotation axis in the holder 31. From the display 64 of the digital gauge 60b, it can be visually confirmed that the lens 30 to be measured was eccentric by 0.123 mm in the X-axis direction with respect to the rotation axis in the holder 31. Then, the absolute value of the eccentricity of the lens 30 to be measured at this time is (0,1232+0°4562)"' = 0
．． It will be 472m.

FIG. 7 is a schematic diagram showing a moving means and a movement amount display means applied to the second embodiment of the present invention, and FIG. 8 is a front schematic diagram showing a state in which a linear encoder is installed.

In this embodiment, the movement amount display means is a linear encoder 70.
This embodiment differs from the first embodiment only in that it is constituted by the amplifiers 70a and 70b, an amplifier 75, and a counter 80.

The linear encoders 70a and 70b are for detecting the amount of movement of the X table 43 and the Y table 44 that move along the X axis and the Y pongee indicated by the dashed line, and are used for detecting the scales 71a and 71b and the detection head. 72a and 72b.

The scale 71a of the linear encoder 70a is attached to the front surface of the X table 43, and the
A scale 73a is formed along the axis at predetermined intervals (see FIG. 8).

The detection head 72a of the linear encoder 70a is, for example, an electric or photoelectric detection head, and is attached to the fixed part 42 via a support part 74a so as to face the scale 71a.

As a result, the detection head 72a or the scale 73a is read, and as the X table 43 moves, the pulse signal is sent to the amplifier 7.
It is designed to output to 5.

On the other hand, a scale 71b of the linear encoder 70b is attached to the left side surface of the Y table 44, and a scale 73b graduated at predetermined intervals along the y-axis is formed on its surface.

A detection head 72b having the same function as the detection head 72a of the linear encoder 70a is attached to the left side surface of the X-table 43 so as to face the scale 71b via the support portion 74b.

The amplifier 75 is for amplifying the pulse signals from the detection heads 72a and 72b and outputting the amplified pulse signals to the counter 80.

The counter 80 is for integrating the signals from the amplifier 75 and displaying the resulting values on displays 80a and 80b. 80b has a built-in drive circuit (not shown) that outputs a command to display the numerical value. 80c and 80d are celery cent buttons.

Note that 85 is an electronic computer required to display the numerical contents displayed on the displays 80a and 80b on the screen and to calculate the absolute value of the amount of eccentricity based on these numerical values.

According to such a configuration, the X table 43 is
When the lens to be measured 30 moves at the same time, the scale 71a of the linear encoder 70a moves in the same direction as the lens to be measured 30, the amount of movement is detected by the detection head 72a, and a pulse signal indicating the amount of movement is output to the amplifier 75. be done.

Furthermore, when the lens to be measured 30 moves along the y-pongee, the scale 7 ],b of the linear encoder 70b moves in the same direction as the lens to be measured 30, and the amount of movement is detected by the detection head 72b. A pulse signal shown is output to the amplifier 75. .

These signals are inputted to a counter 80 via an amplifier 75, and the movement amount of the lens 30 to be measured, that is, the components of the eccentricity of the α1 constant lens 30 in the X-axis direction and the Y-axis direction are displayed on displays 80a and 80b. are displayed respectively.

In the first and second embodiments described above, the moving means and the moving amount display means are provided separately, or, for example, as shown in FIG. 9, the moving devices 50a, 501) are provided with a micrometer function. By doing so, the movers 50a and 50b can be used both as a moving means and a moving amount display means.

Specifically, in FIGS. 4 and 9, the head portion 52
The pitch of the male screw portion 53a is set so that the spindle portion 53 advances by 1 mm when the spindle portion 53 rotates once, and a scale 85 indicating the degree of advancement is formed on the surface of the support portion 51.

A scale 86 that can be read down to 0.01 mm is formed on the outer circumferential edge of the tip end of the head portion 52 by dividing the circumference of this outer circumferential edge into 100 equal parts, and a vernier 87 that can be read down to 0.001 mm is formed. It is formed on the surface of the support part 51.

Further, in the first and second embodiments, the lens to be measured is moved, but the structure is not limited to this. It may also be moved relative to the lens.

〔Effect of the invention〕

According to the lens eccentricity measuring device of the present invention, the moving means can:
The lens to be measured is moved relative to the projection optical system in a direction substantially perpendicular to the optical axis, and the movement amount display means displays the relative amount of movement of the lens to be measured, so the observer can The amount of eccentricity of the lens to be measured can be directly read without being affected by the imaging magnification of the lens.As a result, the time and efficiency of eccentricity measurement work is promoted, and highly accurate eccentricity measurement is possible. It has an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a schematic front view showing the first embodiment of the present invention, FIG. 2 is a top view showing the main parts thereof, and FIGS. 3A and 3B are sectional views showing the holder and deformation of the holder. 4 is a sectional view of a moving device; FIG. 5 is a block diagram of a digital gauge; FIGS. 68 to 6C are explanatory diagrams showing movement of an image on a screen; 7 is a schematic plan view showing the main parts of the second embodiment of the present invention, FIG. 8 is a front view showing the main parts, and FIG. 9 is a plan view showing a modification of the moving device. The 1O diagram is
FIG. 11 is a schematic front view showing a conventional lens eccentricity measuring device. FIG. 11 is an explanatory diagram showing movement of an image on a screen in a conventional example. i...Light projection optical system, 10--Optical axis, 50a, 50b
---Movers, 60a, 60b...Digital gauges, 70a, 70b...Linear encoders, 75--
Amplifier, 80--counter.

Claims (1)

[Scope of Claims] A lens eccentricity measuring instrument having a projection optical system that projects an aiming light source toward a lens to be measured, wherein the lens to be measured is moved in a direction substantially orthogonal to the optical axis of the lens to be measured. A lens eccentricity measuring device comprising: a moving means for moving the lens to be measured relative to the projection optical system; and a moving amount display means for displaying the relative moving amount of the lens to be measured. .