JP3333245B2 - Lens alignment machine and lens alignment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centering machine and a centering method used in a centering step in lens processing.

[0002]

2. Description of the Related Art Conventionally, a centering machine used in a centering step in lens processing is roughly classified by a centering method performed prior to centering. The centering method transmits or reflects the inspection light emitted from one side of the lens, forms an image with the lens, and detects the eccentric state of the lens by observing this image with the eyepiece. Or, a lens is sandwiched between two spindles disposed so as to face each other on the same axis, and the two spindles are pressed together to slide the lens to a predetermined position to perform a centering operation. There is.

A centering method for observing the image of the transmitted or reflected inspection light with an eyepiece is disclosed, for example, in Japanese Utility Model Laid-Open No. 59-167647.
This will be described with reference to FIGS. First, as shown in FIG. 4, after the lens 52 is vacuum-adsorbed to the tip of the lens toy 51, the light flux emitted from the light source 61 is condensed on the chart 62, and the lens 52 is centered through the lenses 63 and 64. Reflect on the surface. The reflected light beam is reflected at right angles by a half mirror 65 provided between the lenses 63 and 64, and an image formed by the lens 66 is observed by the eyepiece 67. If the center of the spherical surface of the lens 52 is not aligned with the optical axis when the lens toy 51 is rotated and observed, the image rotates and draws a circle. Therefore, the position of the lens 52 is adjusted so that the image coincides with the optical axis. Perform centering by doing.

[0005] Next, as shown in FIG. 5, the heating device 71 and the dust holder 72 approach the lens toy 51, the lens toy 51 is heated, and the dust 73 is supplied from the dust holder 72. After this, the heating device 71 and the dust holder 7
2 is retracted, and the lens 52 is fixed to the lens cap 51.

Next, as shown in FIG. 6, a grindstone 74 provided on the same machine contacts the peripheral surface of the lens while moving back and forth in the axial direction, and outer diameter grinding is performed.

[0006]

However, the prior art lens centerer has the following disadvantages. In other words, since the lens is fixed to the lens toy after the lens is centered, there is a disadvantage that the lens is misaligned during bonding. Further, when the lens is fixed to the lens toy, the lens is fixed with reference to the tip of the lens toy. Therefore, if the shape accuracy of the tip of the lens toy deteriorates, there is a disadvantage that processing accuracy is directly affected.

Accordingly, the present invention has been developed in view of the above-mentioned drawbacks in the prior art, and has a high precision without being affected by the misalignment when the lens is fixed and without being affected by the accuracy of the lens toy. An object of the present invention is to provide a lens centering machine and a lens centering method capable of centering.

[0008]

According to the present invention, there is provided a lens centering apparatus comprising: a lens holding shaft rotatably supported by a lens centering machine frame; a lens toy fixedly holding a lens at a tip thereof; and a lens toy fixed to the lens toy. An eccentricity measuring device for confirming the amount of eccentricity between the optical axis of the held lens and the rotation axis of the lens holding shaft, and the eccentricity information from the eccentricity measuring device, the lens yaw is moved with respect to the rotation axis of the lens holding shaft. And a moving mechanism attached to the lens holding shaft so as to be movable in a vertical direction and a tilt direction. In addition, the lens centering method of the present invention includes a moving mechanism that enables a lens holding shaft rotatably supported by a lens centering machine frame to move in a direction perpendicular and inclined to the rotation axis of the lens holding shaft. Attach and measure the eccentricity of the optical axis of the lens fixed to the tip of the lens toy held in the moving mechanism on the rotation axis of the lens holding axis, and move and adjust the lens toy based on the measurement result. Then, centering of the lens is performed.

[0009]

According to the present invention, the amount of eccentricity after fixing the lens to the lens toy is confirmed by an eccentricity measuring device, and the lens toy is moved in a direction perpendicular to a rotation axis (also referred to as a rotation axis) of the lens holding shaft via a moving mechanism. By adjusting the centering by moving in the tilt direction, high-precision centering can be performed without being affected by misalignment when the lens is fixed or the accuracy of the lens cap.

[0010]

Embodiment 1 FIG. 1 is a schematic structural view showing a state after fixing a lens in this embodiment. A base 2 is fixed to a lens holding shaft 1 rotatably supported on a lens centering frame. An XY table 3 is slidably held in the base 2 so as to engage with a guide surface 2 a formed on the base 2 and move only in a direction perpendicular to the center axis A of the base 2. And two XYs provided at a relative angle of 90 degrees to the base 2 in the direction of the central axis A.
It is pressed by the tip 5a of the table adjustment screw 5 and two springs 6 provided at the position of the base 2 facing the XY table adjustment screw 5.

Further, in the XY table 3, a lens toy 7 for fixing the lens 9 to one end is provided.
And slidably held on a guide surface 3a that can be tilted about the center of curvature of the guide surface 3a formed at
To the direction of the central axis B of the XY table 3, the tip 8 a of two lens toy adjusting screws 8 provided at a 90 ° relative angle to the XY table 3 and the position of the XY table 3 opposed to the lens toy adjusting screw 8. It is pressed by the two springs 4 provided. A base 2 fixed to the holding shaft 1, an XY table 3 slidably held in the base 2, a base end side of a lens toy 7 slidably held in the XY table 3, The XY table adjusting screw 5 and the spring 6, and the two lens toy adjusting screws 8 and the spring 4 constitute a moving mechanism for moving the lens toy 7 in a direction perpendicular and inclined with respect to the rotation axis of the lens holding shaft 1.

An eccentricity measuring device 10 for measuring the eccentricity of a lens 9 fixed to a lens toy 7 is provided on an extension of the axis of the lens holding shaft 1. Eccentricity measuring device 10
Is composed of a light source 11, a collimator lens 12, a beam splitter 13, a condenser lens 14, a condenser lens 15, a position sensor 16, and an arithmetic processing unit 17.

Light emitted from the light source 11 is incident on the lens 9 via a collimator lens 12, a beam splitter 13, and a condenser lens 14 provided between the lens 9 and the light source 11. The reflected light reflected by the lens 9 passes through the condenser lens 14, the beam splitter 13, and the condenser lens 15 to the position sensor 1
6. An arithmetic processing unit 17 for obtaining eccentricity information from the position information obtained by the position sensor 16 is connected to the position sensor 16.

In the lens centering machine having the above configuration, first, the lens 9 to be centered is fixed to the lens toy 7 in a state where the lens 9 is centered to some extent with an adhesive (not shown). Next, the eccentricity of the optical axis of the lens 9 and the rotation axis of the lens holding shaft 1 is measured using the eccentricity measuring device 10. The arithmetic processing unit 17 calculates the amount of eccentricity between the rotation axis of the lens holding shaft 1 and the optical axis of the lens 9, that is, the amount of eccentricity in the direction perpendicular to the axis of rotation of the lens holding shaft 1 and the amount of eccentricity in the inclination direction. Is adjusted by rotating the XY table adjusting screw 5 and the tilt direction is adjusted by rotating the lens adjusting screw 8 based on the above.

According to the present embodiment, the amount of eccentricity of the lens after fixing the lens to the lens toy is confirmed by the eccentricity measuring device, and the lens toy is moved in the direction perpendicular to the rotation axis of the lens holding shaft and in the tilt direction. By performing the centering adjustment, high-accuracy centering can be performed without being affected by misalignment when the lens is fixed and without being affected by the accuracy of the lens toy.

[0016]

Embodiment 2 FIG. 2 is a schematic structural view showing a state after fixing a lens in this embodiment. This embodiment corresponds to the first embodiment.
The difference is that the XY table adjustment screw 5 and the lens yoke adjustment screw 8 which constitute the moving mechanism are abolished, and the XY table adjustment piezoelectric element 21 and the lens yoke adjustment piezoelectric element 22 are used instead. The same components are denoted by the same reference numerals and description thereof is omitted. XY table adjusting piezoelectric element 21
The eccentricity measurement device 1
0 (not shown).

In the lens centering machine having the above configuration, first, the lens 9 to be centered is fixed to the lens toy 7 in a state where the lens 9 is centered to some extent with an adhesive (not shown). Next, the eccentricity of the optical axis of the lens 9 and the rotation axis of the lens holding shaft 1 is measured using the eccentricity measuring device 10. The arithmetic processing unit 17 calculates the amount of eccentricity between the rotation axis of the lens holding shaft 1 and the optical axis of the lens 9, that is, the amount of eccentricity in the direction perpendicular to the axis of rotation of the lens holding shaft 1 and the amount of eccentricity in the inclination direction. The vertical position adjustment with respect to the rotation axis based on the value is performed by applying a voltage to the XY table piezoelectric element 21,
The adjustment of the tilt direction is performed by applying a voltage to the lens adjustment piezoelectric element 22.

According to this embodiment, the same effect as in the first embodiment can be obtained, and the voltage of each adjusting piezoelectric element is controlled on the basis of the eccentricity information of the eccentricity measuring device to perform minute positioning. And the centering process can be automated.

[0019]

Embodiment 3 FIG. 3 is a schematic structural view showing a state after fixing a lens in this embodiment. This embodiment corresponds to the second embodiment.
The guide surface 3a of the XY table 3 which constitutes the moving mechanism in the above is formed in a flat shape, and the sliding portion of the lens toy 7 is formed in a flat shape. XY table 3
The lens guide adjusting piezoelectric element 2 is provided on the flat guide surface 3b.
3 are equally disposed on the circumference of the XY table 3 in the axial direction.
a and XY facing the lens adjusting piezoelectric element 22
The lens spring 7 is fixedly held by three springs 23 provided at the position of the table 3.
The XY table adjusting piezoelectric element 21 and the lens adjusting piezoelectric element 22 are connected to an arithmetic processing unit 17 constituting the eccentricity measuring apparatus 10 (not shown). Hereinafter, the configuration is the same as that of the second embodiment except for the configuration of the moving mechanism.

In the lens centering machine having the above configuration, first, the lens 9 to be centered is fixed to the lens toy 7 in a state where the lens 9 is centered to some extent with an adhesive (not shown). Next, the eccentricity of the optical axis of the lens 9 and the rotation axis of the lens holding shaft 1 is measured using the eccentricity measuring device 10. The arithmetic processing unit 17 calculates the amount of eccentricity between the rotation axis of the lens holding shaft 1 and the optical axis of the lens 9, that is, the amount of eccentricity in the direction perpendicular to the axis of rotation of the holding shaft 1 and the amount of eccentricity in the tilt direction.
Based on the value, the vertical position adjustment with respect to the rotation axis is performed by applying a voltage to the XY table piezoelectric element 21, and the tilt direction adjustment is performed by applying a voltage to the lens adjustment piezoelectric element 22.

According to this embodiment, the same effect as that of the second embodiment can be obtained, and a finer position adjustment can be achieved by arranging three lens-toy adjusting piezoelectric elements on the circumference of the XY table in the axial direction. This makes it possible to perform centering with higher precision.

[0022]

As described above, according to the lens centering apparatus and the lens centering method of the present invention, the amount of eccentricity of the lens after fixing the lens to the lens toy is confirmed by the eccentricity measuring device, and the lens toy portion is checked. By moving the lens in the direction perpendicular to the axis of rotation of the lens holding axis and in the direction of inclination to adjust the centering, high-precision centering can be performed without being affected by misalignment when fixing the lens or the accuracy of the lens toy. it can.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment.

FIG. 2 is a schematic configuration diagram showing a second embodiment.

FIG. 3 is a schematic configuration diagram showing a third embodiment.

FIG. 4 is a schematic configuration diagram showing a conventional example.

FIG. 5 is a cross-sectional view showing a conventional example, with a part omitted.

FIG. 6 is a cross-sectional view of a conventional example with a part omitted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lens holding shaft 2 Base 3 XY table 4, 6 Spring 5 XY table adjustment screw 7 Lens toy 8 Lens toy adjustment screw 9 Lens 10 Eccentricity measuring device

Continued on the front page (72) Inventor Seiichi Fukuda 2-43-2 Hatagaya, Shibuya-ku, Tokyo Examiner at O-Linpus Optical Industry Co., Ltd. Ichiro Horikawa (56) References JP-A-3-142156 (JP, A) 15-15 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B24B 9/14

Claims (2)

(57) [Claims] 1. A lens holding shaft rotatably supported on a frame of a lens centering machine, a lens toy fixedly holding a lens at its tip, a rotation axis of an optical axis of the lens fixed and held by the lens toy and a rotation axis of the lens holding shaft. An eccentricity measuring device for measuring the amount of eccentricity of the lens and a moving mechanism for moving the lens toy in a direction perpendicular and inclined to the rotation axis of the lens holding shaft. 2. A lens holding shaft rotatably supported by a lens centering machine frame, and a moving mechanism capable of moving in a direction perpendicular and inclined to a rotation axis of the lens holding shaft is attached to the lens holding shaft. The eccentricity of the optical axis of the lens fixed to the tip of the lens lens in the holding state is measured on the rotation axis of the lens holding shaft, and the lens lens is moved and adjusted based on the measurement result, and then the lens is aligned. A lens centering method characterized by performing centering of a lens.