JPS59108934A - Optical inspecting apparatus for lens - Google Patents

Abstract

PURPOSE:To enhance productivity to a large extent and to improve inspection accuracy by automatic focusing, by providing a lens feeding part, an optical inspection part, a lens width measuring part, an automatic centering part, and a lens taking out part, thereby fully automating the lens inspection. CONSTITUTION:Lenses 22 are mounted on a belt conveyer 29 by lens mounting devices 23, 24, and 25 and sent to a lens inspecting part 60. The width of the lens is measured by a lens width measuring device 34. Based on the measured result, inspections are performed by longitudinal short pitch resolution inspecting part 36, a lateral short pitch resolution inspecting part 37, a longitudinal long pitch resolution inspecting part 38, a lateral long pitch resolution inspecting part 39, and an amount of light inspecting part 40. The pattern surfaces of the lenses are sequentially and automatically aligned with the positions of the surfaces of light receiving tubes 51, 52, 53, 54, and 55 by automatic centering tables 56, 57, 58, 59, and 50. Under the state automatic focusing is performed, each inspection is performed. The lens, whose inspection is finished, is sent to a lens taking out part 72.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to plate lenses, particularly SLA (5ELFOCK LENS ALLE) used as lenses for copying machines.
This invention relates to a device that automatically inspects the vertical and horizontal resolution and light intensity of Y).

Structure of the conventional example and its problems This type of conventional inspection device is slidable by two rows of slide bearings 2 and 3 mounted on the main body 1, as shown in FIGS. 1 and 2. A movable table 4 supported by a motor 6 is moved left and right by a ball screw 7 rotatably supported at both ends via a joint 6 by a motor 6. The movable table has a through-groove portion 8, and a transparent glass plate 9 having thin lines cut at a predetermined pitch in a direction perpendicular to the direction of table movement is attached in contact with the upper surface of the table in this groove. A lens 12 is mounted above the transparent glass plate 9 at a distance by means of a clamp section 10.11 on the table so that light passes vertically therethrough. The attachment and detachment of this lens is performed by an operator. Below the transparent glass, there is a projector 13 that is attached to a fixed body and emits light toward the transparent glass and lens 12 above, and is further spaced at a constant interval above the lens 12 by a frame 14 that is fixed to the body. It has a light receiver 15 which is mounted on the lens and detects the amount of light transmitted through the lens.

The operation of the lens inspection apparatus configured as described above will be described below.

The lens 12 is set by the operator on the clamp part 10.11 on the table 4 so that light is transmitted in the vertical direction. Next, the operator turns on the switch and the motor drives the table 4 forward at a constant speed. During this movement, parallel light is emitted from the projector 13 provided below the lens 12, passes through transparent glass with thin lines cut with a predetermined pinch (hereinafter referred to as a pattern) and the lens 12, and is transmitted through the lens 12 and the projector 13 provided above the lens 12. The intermittent light is detected by the light receiver 15. By recording the continuous light intensity as data for each minute pinch, defects such as scratches, clouding, and chips on the lens surface can be inspected.

However, in the above configuration, a worker attaches each lens to the inspection device one by one, manually focuses, presses the inspection start switch, removes the lens, makes a pass/fail judgment based on the data, and sorts the good and bad products. A lot of work was done using inspection equipment.

For this reason, the productivity of lens inspection is extremely low, and furthermore, visual focusing and lens attachment are prone to variations in condition and the reliability of the inspection results is low.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, the present invention provides a system that fully automates lens inspection to significantly increase productivity, and further improves inspection accuracy through automatic focusing and the like.

Structure of the Invention The present invention facilitates the automation of lens supply by providing a lens supply unit consisting of a plurality of stockers with lids, a plurality of transfer heads, and a transport conveyor, in which plate lenses are stacked and can be taken out from the upper stage. This has the effect of significantly improving productivity.

In addition, the lenses supplied one by one from the lens supply section are placed between the lens and the projector while being continuously conveyed by the drive roller, and the transparent disk containing radial thin lines is continuously rotated on an axis parallel to the light beam. By providing an optical inspection section that has a light receiving section that detects the intermittent light transmitted through the lens, and that sequentially and continuously inspects four items of lens resolution and one item of light intensity,
This not only greatly improves productivity, but also improves inspection reliability as all lenses can be inspected under the same conditions.

The reliability of inspection results is increased by providing an automatic alignment unit that automatically measures the width of the lens with high precision and automatically aligns the center of the lens with the center of the disk surface and light receiving surface based on the measurement results. It is possible to obtain high productivity.

Furthermore, productivity can also be increased by providing a conveyor and a stonker with a lid for sorting good and defective products based on inspection results and a printing section.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows the entire lens optical inspection apparatus according to an embodiment of the present invention. 16.17.1 in Figure 3
Reference numeral 8 denotes a stocker having independently driving parts 19, 20, 21 and a lid, in which lenses 22 are stacked and can be taken out from the top. 23, 24, and 25 are lens transfer devices, each with a suction chuck 26 and 27 at the tip.
．． 28 is attached, and the lenses are taken out one by one from the stocker with lifter. A belt conveyor 29 is located between the stocker with a lifter and the lens transfer device and conveys the lenses. These three lens supply units 3o
While one series is in operation, the other two series allow the operator to make preparations such as stacking lenses. 31 is the pedestal of the inspection department; 3
Reference numeral 2 denotes a precision surface plate, and 33 a lens conveying device of the inspection section, in which one lens is conveyed to each inspection device section.

34 is a lens width measuring device that measures the lens width by moving a measuring stylus 35 of an electric micrometer back and forth and making contact with the side surface of the lens. 36 is vertical and short pisochi resolution inspection department, 3
Reference numeral 7 designates a horizontally short pitch resolution testing section, 38 a vertically long pitch resolution testing section, 39 a horizontally long pitch resolution testing section, and 40 a light amount testing section. 41, 42, 43, 44, and 45 are projectors that serve as light sources for each inspection section, and 46, 47, 48, and 49 are provided between the lens and the projector, and are connected to motors, respectively. Pattern made of transparent disks with radial thin lines on the circumference that rotate synchronously, 5
1.52, 53, 54.55 are light receiving tubes for detecting the intermittent light transmitted through the lens, and are located on the opposite side of the pattern to the lens.

56.57.57.58.50 are the arc tubes, respectively;
Move the pattern and receiver tube to the specified position with respect to the lens 2
It is a self-aligning table that allows positioning. Reference numeral 60 indicates the entire optical inspection section, and reference numeral 61 indicates an electrical control box. 62
6 is a belt conveyor that transports all the lenses that have been optically inspected; 63 is a non-defective product number printing machine; 84 is a defective product number printing machine;
6 is a stocker with a lid for stacking defective products, 66 is a lens transfer device for transferring a stocker lens with a lifter from the belt conveyor, and 67 is a suction chuck head. 68 is a good lens stacking device, 69 is a good lens transfer device, 70 is also a chuck, and 71 is a good product stonk conveyor, which transfers lenses that have been stacked to a certain number by the good lens stacking device one block at a time. It will be stocked. Reference numeral 72 indicates the entire lens extraction section.

Regarding the lens optical inspection device configured as above,
The operation will be explained below.

The lenses 22U loaded in advance by the operator are transferred one by one to the belt conveyor 2 using the lens transfer device.
9 and is conveyed by the conveyor 29 and sequentially sent to the conveying section of the lens inspection section 60. The width dimension of the lens that has arrived at the inspection section 6o is measured by the lens width measuring device 34, and based on the measurement results, the width dimension is measured by the vertical/short pinch resolution inspection section 36° and the horizontal/short pitch resolution 37. Vertical pitch resolution inspection section 38, horizontal pitch resolution inspection section 39. Light intensity inspection section 4o
At each position, the pattern surface and the light receiving tube surface are automatically aligned with respect to the lens using an automatic alignment table, and each inspection is performed with automatic focusing in place. Lenses that have been inspected are sent to the belt conveyor of the lens take-out section 72. Lenses whose inspection item values deviate from the standard values are assigned a defective product number, and lenses whose values are within the standard value range are assigned a non-defective product number. After printing, defective products are transferred from the belt conveyor to a stocker with a lid for defective products by a defective product transfer device, and stacked one by one from above. Lenses that are still in good quality are stacked from below by a good lens stacking device at the end of the belt conveyor in a fixed number, and are transferred to a good stocking conveyor by a good lens transfer device every fixed number of lenses.

Effects of the Invention As described in 2, the present invention fully automates the optical inspection of lenses by providing a lens supply section, an optical inspection section, a lens width measurement section, an automatic centering section, and a lens take-out section. This greatly increases productivity, and also improves inspection accuracy through automatic focusing, etc., and the effects are significant.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional lens optical inspection device, FIG. 2 is a side view of the same, and FIG. 3 is a perspective view of an embodiment of the present invention. 16.17.18・・・Stocker with lifter,
22...Lens, 26,27.28...
- Transfer head, 30... Lens supply section, 41.
421-43゜44.45... Floodlight, 33...
...Lens transport section, 46.47.48.49...
...Pattern, 34...Lens width measurement section, 5
1.62.63.54.65... Light receiver, 60
...Optical inspection department, 56, 57° 58.59.6
0... Automatic alignment section, 62... Conveyance = +
7 Hair, 63.64...Printing Department, 65...
... Stocker with lifter, 72 ... - Lens ejection part.

Claims (1)

[Claims] A lens supply unit consisting of a plurality of stockers with lids that stack plate lenses and can be taken out from the upper stage, a plurality of transfer heads, and a conveyor; , an optical inspection section that continuously rotates a transparent disk with radial thin lines on an axis parallel to the light beam and has a light receiving section that detects intermittent light transmitted through the lens, and that inspects the resolution and light amount of the lens; Equipped with a lens width measurement section that automatically measures the width of the lens, an automatic centering section that aligns the center of the lens with the center of the disc surface and the light receiving surface, and a lens removal section that has a conveyor, a printing section, and a stocker with a lid. Lens optical inspection equipment.