JP2009198204A - Apparatus for measuring outer diameter of lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To highly accurately measure the outer diameters of even very-small-diameter lenses and accurately measure the outer diameters of even lenses that are mounted at an angle. <P>SOLUTION: A lens outer-diameter measuring apparatus 1 for measuring the outer diameter of a lens W is provided with: a lens holder 7 for holding the lens W in contact with one optical surface of the lens W; a measuring part 5 comprising both a light source part 13 for irradiating light from a radial direction to the lens W held in the lens holder 7 and a light-receiving part 14 opposed to the light source part 13 on both sides of the lens W and capable of measuring the outer diameter of the lens W in a prescribed cross section without contact; an adjusting part 3 constituted in such a way as to adjust the inclination of the lens holder 7 to the light source part 13; a spindle 9 for rotating the lens holder 7 and the adjusting part 3 on its own axis; and a computation part 6 connected to the measuring part 5 for computing the outer diameter of the lens W on the basis of signals from the measuring part 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lens outer diameter measuring device that measures the outer diameter of a lens.

  Conventionally, when measuring the outer diameter of a lens, the measurement target lens is often held by using a caliper or a micrometer. However, when the target lens has a small diameter, etc., it is not easy to ensure accuracy and measurement operation, and the lens may be lost due to mishandling of the lens. It is preferable to measure.

As an apparatus for measuring the outer diameter of an article in a non-contact state, an apparatus described in Patent Document 1 is known. As shown in FIG. 6, the apparatus 100 includes a linear member clamping / rotating mechanism unit 101 configured to be rotatable by clamping an end of a linear member 105 having a predetermined length to be measured, and a wire. A main body 103 to which a laser outer diameter measuring head 102 capable of measuring the outer diameter of the linear body 105 sandwiched between the strip body sandwiching / rotating mechanism 101 by a non-contact response and a measurement signal from the main body 103 are received. And an arithmetic device 104 capable of calculating, displaying, and recording the outer diameter average value, outer diameter maximum value, flatness, and the like of the linear body 105.
JP 2001-41714 A

However, when trying to measure the outer diameter of the lens with the apparatus described in Patent Document 1, there are the following problems.
In the apparatus described in Patent Document 1, the object to be measured is a wire rod, and the structure of each mechanism such as the linear body clamping / rotating mechanism unit 101 is not suitable for lens measurement. Specifically, since the striatum pinching / rotating mechanism 101 simply fixes the end of the striatum, the lens to be measured is inclined with respect to the laser outer diameter measuring head 102. When sandwiched and fixed in a state, the outer diameter value of the lens is measured as a larger value than the actual value. Since the mechanism for correcting the above-described tilt is not provided in the apparatus described in Patent Document 1, in such a case, there is a problem that the outer diameter of the lens cannot be measured accurately.

  The present invention has been made in view of the above circumstances, and is a lens that can measure with high accuracy even with a minute diameter lens, and can accurately measure the outer diameter even when the lens is tilted. An object is to provide an outer diameter measuring device.

  The present invention is a lens outer diameter measuring device for measuring an outer diameter of a lens, the holding member holding the lens in contact with one optical surface of the lens, and the holding member held by the holding member A non-contact outer diameter measurement that includes a light source that irradiates light from a radial direction to a lens and a light receiving unit that faces the light source across the lens, and that can measure the outer diameter of the lens in a predetermined cross section in a non-contact manner. An adjustment unit configured to be able to adjust the inclination of the holding member with respect to the light source, a rotation mechanism for rotating the holding member and the adjustment unit around its own axis, and the non-contact outer diameter measurement unit And a calculation unit that calculates the outer diameter of the lens based on a signal from the non-contact outer diameter measurement unit.

  According to the lens outer diameter measuring device of the present invention, the outer diameter of the lens is accurately measured by the arithmetic unit by changing the inclination of the holding member holding the lens by the adjusting unit and rotating the rotating mechanism.

  The lens outer diameter measuring device according to the present invention detects a minimum value of the outer diameter values of the lens calculated by the calculating unit and outputs a detection signal while changing the inclination of the holding member by the adjusting unit. A minimum outer diameter value notification unit may be further provided. In this case, since the minimum outer diameter value notification unit detects the minimum value of the lens outer diameter and outputs a signal, the tilt of the lens is appropriately adjusted using the signal as a clue, and more accurate and accurate outer diameter measurement is possible. It can be carried out.

  A plurality of the holding members may be provided corresponding to the outer diameter of the lens, and may be attached to the adjustment unit in a replaceable manner. In this case, the outer diameter can be measured with higher accuracy by selecting and using an appropriate holding member corresponding to the approximate outer diameter of the lens.

  The holding member may be a lens yatoi having a shape that can be attached to the lens processing machine. In this case, since it is easy to attach to and detach from the processing machine, it is possible to easily check the processing accuracy during lens processing, perform additional processing, and the like.

  The measurement unit may be movable relative to the holding member in a rotation axis direction of the rotation mechanism. In this case, it is possible to smoothly measure the outer diameter of different cross sections of one lens and easily measure the maximum outer diameter of the entire lens.

  According to the lens outer diameter measuring apparatus of the present invention, even a lens with a minute diameter can be measured with high accuracy, and the outer diameter can be accurately measured even when the lens is mounted with an inclination.

A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a lens outer diameter measuring apparatus (hereinafter simply referred to as “outer diameter measuring apparatus”) 1 according to the present embodiment, and FIG. 2 is a diagram showing a configuration of the outer diameter measuring apparatus 1. is there.
As shown in FIGS. 1 and 2, the outer diameter measuring device 1 includes a holding unit 2 that holds the lens W, an adjustment unit 3 for adjusting the inclination of the holding unit 2, and the holding unit 2 and the adjustment unit 3. A rotating unit 4 for rotating, a measuring unit (non-contact outer diameter measuring unit) 5 for measuring the outer diameter of the lens W held by the holding unit 2 in a non-contact manner, and an arithmetic unit 6 connected to the measuring unit 5 And has.

The holding unit 2 includes a lens holder (holding member) 7 that sucks and holds the lens W, and a fixing member 8 to which the lens holder 7 is attached. The lens holder 7 is connected to a suction mechanism (not shown), and one optical surface Wa of the lens W is sucked and held. The fixing member 8 is mounted on a swing stage (described later) on the upper surface of the adjustment unit 3 so as to be coaxial with the swing stage, and the lens holder 7 is detachably fixed.
Various mechanisms can be adopted as a fixing means between the lens holder 7 and the fixing member 8. In the present embodiment, the female screw portion 7A of the lens holder 7 is fitted to the male screw portion 8A provided so as to protrude on the axis of the fixing member 8, whereby the both are integrally fixed.
Note that a plurality of types of lens holders 7 having different suction surface sizes for sucking and holding the lens are prepared, and can be appropriately selected according to the approximate diameter of the lens to be measured.

  The upper surface of the adjusting unit 3 is a swing stage 3A that is movable in the α and β directions indicated by arrows in FIG. A first adjustment stage 3B for moving the swing stage 3A in the α direction and a second adjustment stage 3C for moving the swing stage 3A in the β direction are stacked below the swing stage 3A. Yes. As the adjustment unit 3, a known gonio stage or the like can be employed.

The rotating unit 4 includes a spindle (rotating mechanism) 9 attached below the adjusting unit 3 and a pair of pulleys 10 </ b> A and 10 </ b> B for rotating the spindle 9.
The spindle 9 is attached so as to be coaxial with the adjusting unit 3. A connecting shaft 9B coaxial with the rotating shaft 9A of the spindle 9 extends below the spindle 9, and the spindle 9 is connected to the pulley 10A via the connecting shaft 9B.

  The pulley 10 </ b> A is connected to the other pulley 10 </ b> B and the belt 11. The pulley 10B is coaxially connected to the handle 12, and when the user rotates the handle 12, the rotation of the pulley 10B that rotates in conjunction with the rotation is transmitted to the pulley 10A via the belt 11, and the adjustment unit 3 and the adjustment unit. 3 can be rotated around the axis of the spindle 9 (rotating shaft 9A). The swing centers of the first adjustment stage 3B and the second adjustment stage 3C are set so as to be located on the axis of the spindle 9.

The measurement unit 5 includes a light source unit 13 and a light receiving unit 14. The light source unit 13 and the light receiving unit 14 are disposed so that the lens W faces each other across the lens W from the radial direction, that is, the direction substantially parallel to the optical surface Wa (that is, the outer peripheral surface Wb side). From the light source part 13, strip | belt-shaped parallel light is irradiated. The irradiated parallel light is partially blocked by the lens W and reaches the light receiving unit 14. The light received by the light receiving unit 14 is sent to the calculation unit 6 as a signal corresponding to the amount of light and processed, whereby the outer diameter of the lens W can be measured in a non-contact manner.
Further, the measuring unit 5 can move up and down in parallel with the axis (rotation axis) of the spindle 9 by a moving mechanism (not shown), and can measure the outer diameters of different cross sections of the lens W.

  The calculation unit 6 includes a calculation circuit 15 that processes a signal from the light receiving unit 14, a notification unit (minimum outer diameter value notification unit) 16 that transmits a signal according to a calculation value of the calculation circuit 15, and a calculation of the calculation circuit 15. And a display unit 17 for displaying the result. The calculation unit 6 may be configured by a device such as a personal computer connected to the measurement unit 5.

  The arithmetic circuit 15 calculates a region where the light from the light source unit 13 is blocked by the lens W based on the signal from the light receiving unit 14, and an arbitrary horizontal section of the region (that is, orthogonal to the axis of the spindle 9). The dimension in the direction cross section is calculated as the outer diameter value.

The notification unit 16 monitors the outer diameter value of the lens W in an arbitrary horizontal section when each of the adjustment stages 3B and 3C of the adjustment unit 3 is operated, and outputs a signal when the minimum value is detected. Details will be described later.
The display unit 17 can adopt a known configuration such as various displays, and may be provided integrally with the arithmetic circuit 15 or may be a separate device connected to the arithmetic circuit 15.

The operation | movement at the time of use of the outer diameter measuring apparatus 1 comprised as mentioned above is demonstrated below.
The user selects the lens holder 7 having a suction surface having a size suitable for the lens W to be measured, and fixes the lens holder 7 to the fixing member 8 by screwing. Then, the one optical surface Wa of the lens W is attracted to the attracting surface of the lens holder 7, and the lens W is held by the lens holder 7. At this time, since the lens W is held in a state of being randomly placed on the lens holder 7, the optical axis of the lens W is not necessarily coincident with the rotation axis 9 </ b> A of the spindle 9. The shaft is held in a state having a certain inclination with respect to the rotation shaft 9A.

  When the outer diameter is measured in a state where the optical axis of the lens W is inclined with respect to the rotation axis 9A of the spindle 9, as shown in FIG. 3, the value of the outer diameter of the lens W is larger than the actual outer diameter value φA. Sometimes measured as large φB. In order to prevent this and accurately measure the outer diameter, the adjustment unit 3 is operated to adjust the direction of the lens W. The adjustment procedure will be described below.

  First, the user emits parallel light from the light source unit 13 of the measurement unit 5, rotates the handle 12 so that the parallel light and the tilt direction of the first adjustment stage 3 </ b> B are at right angles, and the spindle 9 and the adjustment unit 3. To adjust the position of the first adjustment stage 3B.

  When the angle formed between the parallel light and the tilting direction of the first adjustment stage 3B becomes a right angle, the user operates the knob to swing the first adjustment stage 3B in the α direction. During the swing, the arithmetic circuit 15 of the arithmetic unit 6 calculates the outer diameter of the lens W based on the signal from the light receiving unit 14. The arithmetic circuit 15 stores the minimum value every time the calculated outer diameter value updates the minimum value. When the minimum value is detected, the notification unit 16 outputs a signal notifying that it is the minimum value. This signal may be output as audio or may be displayed as visual information on the display unit 17.

  The outer diameter value of the lens W is minimized when the optical axis of the lens W coincides with the rotation axis 9A of the spindle 9, except for rare exceptions such as not being processed properly. The user swings the first adjustment stage 3B using the signal from the notification unit 16 as an index, and fixes the first adjustment stage 3B at a point where the outer diameter value is minimized. This completes the tilt adjustment of the lens W in the α direction.

  After the adjustment of the inclination of the lens W in the α direction is completed, the user operates the handle 12 to rotate the spindle 9 so that the parallel light from the light source unit 13 and the tilting direction of the second adjustment stage 3C form a right angle. The position of the second adjustment stage 3C is adjusted. Then, the second adjustment stage 3C is operated in the same manner as the first adjustment stage 3B described above to adjust the inclination of the lens W in the β direction. When the tilt adjustment in the β direction is completed, the optical axis of the lens W and the rotation axis 9A of the spindle 9 are substantially coincident with each other, and an accurate outer diameter measurement is possible.

Thereafter, the user operates the handle 12 to rotate the adjustment unit 3 and the holding unit 2 by 360 degrees or more. During the rotation, the arithmetic circuit 15 continues to calculate the outer diameter value of the lens W and displays the maximum value on the display unit 17 as the determined outer diameter value of the lens W.
If the lens W has a thickness equal to or greater than a predetermined value, for example, when it is desired to measure the outer diameter at three cross sections H1, H2, and H3 as shown in FIG. The measurement part 5 may be moved to the height of each cross section and the outer diameter may be measured in each cross section.

  According to the outer diameter measuring apparatus 1 of this embodiment, the tilt of the lens W held by the lens holder 7 of the holding unit 2 can be adjusted by the adjusting unit 3 installed coaxially with the spindle 9. Even if W is held by the lens holder 7 in a state of being inclined with respect to the rotation axis of the spindle 9, the outer diameter can be accurately measured by accurately adjusting the inclination of the lens W.

  Further, when adjusting the inclination of the lens W by operating the adjusting unit 3, the notification unit 16 outputs a signal when the outer diameter value of the lens W is minimized, so that the user can adjust the optical axis of the lens W and the spindle 9. It is possible to easily recognize the point where the rotation axis 9A substantially coincides and perform the adjustment operation of the adjustment unit 3.

  Further, since the measuring unit 5 is configured to be able to move up and down in parallel with the axis of the spindle 9, the outer diameter can be easily measured at a plurality of different cross sections of the lens W.

  In the present embodiment, an example in which a movement mechanism (not shown) is provided in the measurement unit 5 has been described. However, as long as the measurement unit 5 can be moved relative to the holding unit 2 in parallel with the axis of the spindle 9, It is possible to easily measure the outer diameter of a plurality of different cross sections of the lens W. Therefore, instead of providing a moving mechanism in the measuring unit 5, a moving mechanism may be provided in the spindle 9 or the adjusting unit 4 so as to be movable along the axial direction of the spindle 9.

Next, an outer diameter measuring apparatus according to a second embodiment of the present invention will be described with reference to FIG. The difference between the outer diameter measuring device 21 of the present embodiment and the outer diameter measuring device 1 of the first embodiment is that a series of measuring steps including adjustment of the tilt of the lens can be automatically performed. is there.
In addition, about each structure already mentioned in the said 1st Embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  FIG. 5 is a diagram showing the overall configuration of the outer diameter measuring device 21. The outer diameter measuring device 21 includes a control unit 22 for controlling operations of the adjusting unit 3 and the rotating unit 26.

  The lens W is held by being attached to a lens yato 23 having a shape that can be attached to and detached from other processing machines. That is, in the present embodiment, the lens yatoy 23 functions as a holding member. The lens holder 25 of the holding portion 24 is formed in a shape that allows the lens yatoy 23 to be fitted and fixed.

  Each adjustment stage 3 </ b> B, 3 </ b> C of the adjustment unit 3 is provided with a drive mechanism such as a motor (not shown) and is connected to the control unit 22. The tilt movement is possible under the control of the control unit 22.

An encoder 28 is attached to a connecting shaft 9B coaxial with the rotating shaft 9A of the spindle 9 of the rotating portion 26 via a coupling 27. The encoder 28 is attached to the control unit 22 so that the control unit 22 can recognize the rotation amount of the spindle 9.
A motor 29 is attached to the pulley 10 </ b> B, and the motor 29 is connected to the control unit 22. Accordingly, the spindle 29 can be rotated by driving the motor 29 under the control of the control unit 22.

The control unit 22 is connected to the personal computer 30. Further, the calculation unit 6 is also connected to the personal computer 30.
As another example, an outer diameter measuring device in which the control unit 22 and the calculation unit 6 are stored in the personal computer 30 and the personal computer 30 performs the functions of the control unit 22 and the calculation unit 6 including the notification unit 16 and the display unit 17. 21 may be configured.

  In the outer diameter measuring device 21 configured as described above, the lens W is held by the lens Yate 23 and fixed to the holding unit 24. When the user activates the outer diameter measuring device 21, the control unit 22 controls the motor 29 and the adjustment. The unit 3 is operated, and the inclination of the lens W is automatically adjusted based on the detection value of the calculation unit 6. Thereafter, the outer diameter is automatically measured using the measurement unit 5 and the calculation unit 6 while rotating the spindle 9 via the motor 29.

According to the outer diameter measuring device 21 of the present embodiment, a series of outer diameter measuring operations are automatically performed by the control unit 22 controlling each mechanism. Therefore, the user can easily perform accurate outer diameter measurement simply by holding the lens W on the lens yatoy 23 and setting the lens W on the holding unit 24.
Further, since the holding member that holds the lens W is the lens yatoe 23 that can be attached to and detached from other processing machines, it is possible to easily perform accuracy evaluation during processing or after processing, or additional processing after shape evaluation.

  Although the embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

It is a perspective view which shows the lens outer diameter measuring apparatus of 1st Embodiment of this invention. It is a figure which shows the structure of the whole lens outer diameter measuring apparatus. It is a figure which shows the relationship between the inclination of a lens, and the diameter measured. It is a figure which shows the example which measures an outer diameter in the some cross section of a lens. It is a figure which shows the structure of the whole lens outer diameter measuring apparatus of 2nd Embodiment of this invention. It is a figure which shows the conventional outer diameter measuring apparatus.

Explanation of symbols

1, 21 Lens external shape measuring device 3 Adjustment unit 5 Measurement unit (Non-contact outer diameter measurement unit)
6 Calculation unit 7 Lens holder (holding member)
9 Spindle (rotating mechanism)
13 Light source unit 14 Light receiving unit 16 Notification unit (Minimum outer diameter value notification unit)
23 Lens Yatoi (holding member)

Claims (5)

A lens outer diameter measuring device for measuring the outer diameter of a lens,
A holding member that holds the lens in contact with one optical surface of the lens;
A light source that irradiates light from the radial direction to the lens held by the holding member; and a light receiving portion that faces the light source across the lens, and the outer diameter of the lens in a predetermined cross section is contactless A non-contact outer diameter measuring unit capable of measurement;
An adjustment unit configured to be able to adjust the inclination of the holding member with respect to the light source;
A rotation mechanism for rotating the holding member and the adjusting portion about its own axis;
A calculation unit that is connected to the non-contact outer diameter measurement unit and calculates an outer diameter of the lens based on a signal from the non-contact outer diameter measurement unit;
A lens outer diameter measuring device comprising:   A minimum outer diameter value notifying unit that detects a minimum value and outputs a detection signal among the outer diameter values of the lens calculated by the calculating unit while changing the inclination of the holding member by the adjusting unit. The lens outer diameter measuring apparatus according to claim 1.   3. The lens outer diameter measuring device according to claim 1, wherein a plurality of the holding members are provided corresponding to the outer diameter of the lens, and are attached to the adjustment unit in a replaceable manner.   The lens outer diameter measuring device according to claim 1, wherein the holding member is a lens yatoi having a shape that can be mounted on a processing machine for the lens.   3. The lens outer diameter measuring device according to claim 1, wherein the non-contact outer diameter measuring unit is relatively movable with respect to the holding member in a rotation axis direction of the rotation mechanism.

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