JPH1068601A - Detector for hidden mark on glass lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a detector for a hidden mark on a glass lens by which the hidden mark on the glasses lens can be detected with good efficiency and simply and which can enhance the productivity of the glass lens. SOLUTION: A detector 10 for hidden marks 5, 6 on a glass lens 1 is provided with point light sources 21, 22, with a transparent stage 30 which holds the glass lens 1 and through which beams of light radiated from the point light sources 21, 22 are transmitted and with imaging devices 41, 42 by which beams of light transmitted through the glass lens 1 are detected on the opposite of the point light sources 21, 22 with reference to the transparent stage 30. As a result, even when the hidden marks 5, 6 on the glass lens 1 are not confirmed directly by a naked eye, they can be detected automatically by the imaging devices 41, 42. Consequently, the hidden marks 5, 6 on the glass lens 1 can be detected with good efficiency and simply, and the productivity of the glass lens can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle lens hidden mark detecting device for detecting a hidden mark imprinted on a spectacle lens.

[0002]

2. Description of the Related Art A spectacle lens 1 shown in FIG. 2 is a bifocal spectacle lens. In such a spectacle lens 1, for example, at a predetermined position on a vertical reference line passing through the center position O of the spectacle lens 1, in order to inspect whether or not the power of the bifocal lens for which the order is received is satisfied, Areas R1 (distance measuring area) and R2 for measuring frequency
(A near-use power measurement area) is formed.

In measuring the power of the spectacle lens 1, the two hidden marks 5 and 6 formed on the surface 2 of the spectacle lens 1 are checked with the naked eye, and these hidden marks 5
The center position O of the spectacle lens 1 is derived based on (6) and (6), and the positions of the frequency measurement regions R1 and R2 are found based on the center position O.

The hidden marks 5 and 6 formed on the spectacle lens 1 are used as a reference for deriving the center position O of the lens even when the outer shape of the spectacle lens 1 is adjusted. That is, in the lens shaping process, the center position O of the spectacle lens 1 is derived based on the two hidden marks 5 and 6, and the spectacle lens 1 is processed into an elliptical shape or a circular shape based on the center position O. ing.

[0005]

However, the hidden marks 5 and 6 are, for example, single letters of the alphabet, simple figures such as circles and squares, and are approximately 1.6 m in length.
Since it is a very small m-square object, it is hard to find with the naked eye. Therefore, it takes a lot of trouble to derive the center position O of the spectacle lens 1. Further, even if the hidden marks 5 and 6 can be confirmed with the naked eye, it takes a long time because the hidden marks 5 and 6 are visually confirmed. There is a problem that the property is low.

An object of the present invention is to solve the above problems,
It is an object of the present invention to provide a spectacle lens hidden mark detection device capable of efficiently and easily detecting a hidden mark of a spectacle lens.

[0007]

In order to solve the above-mentioned problems, according to the present invention, as an apparatus for detecting a hidden mark of a spectacle lens, light emitted from a point light source transmitted or reflected by the spectacle lens is automatically detected by an imaging device. By detecting, the hidden mark of the spectacle lens is detected.

As shown in FIG. 1, an apparatus 10 for detecting a hidden mark of a spectacle lens according to the present invention comprises point light sources 21 and 22;
A transparent stage 30 (holding means) for holding the spectacle lens 1 having the hidden marks 5 and 6 engraved on the surface 2 and transmitting the light emitted from the point light sources 21 and 22, and a point light source 21 for the transparent stage 30 Imaging device 4 for detecting light transmitted through spectacle lens 1 on the side opposite to and 22
1 and 42 are provided.

As the point light sources 21 and 22, for example, a light emitting diode or a laser diode can be used, and light can be emitted.

The transparent stage 30 is made of a material such as a glass plate, a plastic plate or the like that can transmit light emitted from the point light sources 21 and 22, and is provided on a surface opposite to the side where the point light sources 21 and 22 are provided. The spectacle lens 1 is placed. The holding means is not limited to the stage, but may be a chuck type for holding the outer peripheral portion of the spectacle lens 1 therebetween. The spectacle lens 1 mounted on the transparent stage 30 has two hidden marks 5 and 6 engraved on its surface 2 in the same manner as the spectacle lens described with reference to FIG. 6, the center position O of the spectacle lens 1 can be found. The imaging device 41 is installed on a substantially linear extension connecting the point light source 21 and the hidden mark 6 of the spectacle lens 1,
The emitted light from the point light source 21 that has passed through the hidden mark 6 can be detected. An imaging device 42 is disposed on a substantially straight line extending between the hidden mark 5 and the point light source 22 so that light emitted from the point light source 22 passing through the hidden mark 6 can be detected. As the imaging devices 41 and 42, for example, a charge transfer device (CC
Those provided with D) can be used.

The mark detection optical paths L1 and L2 from the point light sources 21 and 22 to the imaging devices 41 and 42 are respectively set obliquely with respect to the optical axis L0 of the spectacle lens 1 mounted on the transparent stage 30. I have. Therefore, even when two sets of the point light sources 21 and 22 for detecting the hidden marks 5 and 6 at narrow intervals and the image pickup devices 41 and 42 are arranged, there are few spatial restrictions for disposing them. If there is enough space for arranging the point light sources 21 and 22 and the imaging devices 41 and 42, the mark detection optical paths L1 and L2 may be set in parallel.

Further, in the spectacle lens hidden mark detecting device 10 of the present invention, the control unit 60 (image processing device) that processes and outputs the output signals from the image pickup devices 41 and 42 as the hidden mark 5 and 6 video signals. ) And a monitor 70 for displaying the hidden marks 5 and 6 based on the video signal from the control unit 60. Therefore, the hidden marks 5 and 6 can be automatically detected by the imaging devices 41 and 42, and also can be detected by the monitor 70. Monitor 70
In this case, there is an advantage that the hidden marks 5 and 6 enlarged and displayed there can be visually confirmed.

The apparatus 10 for detecting a hidden mark of a spectacle lens according to the present invention configured as described above is used, for example, when measuring the power of the power measurement areas R1 and R2 provided in the spectacle lens 1. That is, the imaging devices 41 and 42
Then, the hidden marks 5 and 6 are detected, the center position O of the lens is found based on the detection result, and the frequency measurement regions R1 and R2 are derived based on the center position O. The spectacle lens hidden mark detection device 10 of the present invention is also used for shaping the spectacle lens 1.
That is, the hidden marks 5 and 6 are detected by the imaging devices 41 and 42, the center position O of the lens is derived based on the detection result, and the eyeglass lens 1 is processed into a predetermined outer shape based on the center position O. .

As described above, in the eyeglass lens hidden mark detecting device 10 of the present invention, the hidden marks 5 and 6 can be automatically detected by the imaging devices 41 and 42 without directly seeing the hidden marks 5 and 6 with the naked eye. The efficiency of power measurement and shaping of the spectacle lens can be greatly improved. Thereby, the productivity of the spectacle lens 1 can be improved.

The spectacle lens hidden mark detection device 10 of the present invention is not limited to two hidden marks for spectacle lenses, but can be applied to one or three or more hidden marks.

The apparatus 10 for detecting a hidden mark of a spectacle lens according to the present invention, for example, when there are two hidden marks,
Instead of arranging two sets of point light sources and imaging devices, one point light source
And two imaging devices may be arranged. It is also possible to adopt a configuration in which a set of point light sources and an imaging device are arranged. Further, the number of point light sources may be two and the number of imaging devices may be one.

Further, the hidden mark detecting apparatus 10 for eyeglass lenses according to the present invention includes the point light sources 21 and 22 and the imaging devices 41 and 42 so as to detect the light reflected by the hidden marks 5 and 6. By arranging the hidden marks 5 and 6 of the lens 1 on the side of the surface 2 on which the hidden marks 5 and 6 are engraved, the hidden marks 5 and 6 may be detected by light reflected from the spectacle lens 1. In this case, since the hidden marks 5 and 6 are detected without passing through the spectacle lens 1, there is an advantage that the thickness marks of the spectacle lens 1 are not easily affected. Further, since the optical path for mark detection is set obliquely because of the reflection type, even when two sets of the point light source and the imaging device are arranged, there is little spatial restriction on the positions where the sets are arranged.

In the eyeglass lens hidden mark detecting device 10 of the present invention, dimming filters 51 and 52 are disposed in front of the imaging devices 41 and 42. That is, the dimming filters 51 and 52 are arranged in the optical path to the spectacle lens 1 and the imaging devices 41 and 42. By providing the light control filter 50 in this way, even if the intensity of the light emitted from the point light sources 21 and 22 is high, the light intensity can be reduced by the light control filter 50. For this reason, since the imaging devices 41 and 42 do not directly detect high-intensity light, a highly reliable spectacle lens hidden mark detection device 10 can be realized.

[0019]

As described above, according to the apparatus for detecting a hidden mark of a spectacle lens of the present invention, it is not necessary to directly check the hidden mark with the naked eye, so that the hidden mark of the spectacle lens can be detected quickly and efficiently. Therefore, an inspection process and a shaping process that require deriving the center position of the lens from the hidden mark can be efficiently performed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an apparatus for detecting a hidden mark of a spectacle lens to which the present invention is applied.

FIG. 2A is a plan view of a plastic spectacle lens,
(B) is a sectional view taken along line bb 'of (a).

[Explanation of symbols]

 Reference Signs List 1 eyeglass lens 5, 6 hidden mark 10 hidden mark detection device for eyeglass lens 30 transparent stage 41, 42 imaging device 51, 52 dimming filter 60 control unit (image processing device) 70 monitor L1, L2 mark detection optical path

Claims (7)

[Claims] 1. A holding means for holding a spectacle lens having a hidden mark formed on a surface thereof, a light source for irradiating light to the spectacle lens held by the holding means, and transmitting or reflecting through the spectacle lens. An image pickup device for detecting the hidden mark based on the light emitted from the light source. 2. The eyeglass lens according to claim 1, wherein
A hidden mark detecting device for a spectacle lens, comprising: two hidden marks; and two sets of the light source and the image pickup device for detecting the two hidden marks. 3. The apparatus according to claim 1, wherein a mark detection optical path from the light source to the image pickup device is set obliquely with respect to the optical axis of the spectacle lens. . 4. The method according to claim 1, wherein
A hidden mark detecting device for a spectacle lens, wherein a dimming filter is interposed at an intermediate position in an optical path from the spectacle lens to the imaging device. 5. The method according to claim 1, wherein
Furthermore, a hidden mark detecting device for a spectacle lens, further comprising monitor means for displaying a result of the detection of the hidden mark by the imaging device. 6. The method according to claim 1, wherein
The apparatus for detecting a hidden mark of a spectacle lens, wherein the imaging apparatus includes a charge transfer device. 7. The method according to claim 1, wherein
The apparatus according to claim 1, wherein the light source is a light-emitting diode.