JPH0338683Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a lens meter that measures the refractive properties of eyeglass lenses. The present invention relates to a lens meter test lens determining device for automatically determining whether the lens is a lens or a left eye lens.

Prior Art As a conventional example of this type of test lens determining device, the device disclosed in US Pat. No. 4,098,002 is known.
This device has a lens table that has the function of holding the lens to be tested and regulating its optical or geometrical position, and there are pressure sensors on both ends of the table surface at intervals of about 1.5 times the front length of the glasses. A pressure-sensitive part with a built-in response switch is installed, and if the lens to be tested is a right-eye lens, the left lens frame of the glasses presses the left pressure-sensitive part to activate the switch, and the switch is reversed. If the lens to be tested is for the left eye, the lens frame on the right side presses the pressure sensitive section on the right side to activate the switch. In this manner, the apparatus is a determination device that automatically determines which side of the lens is currently being measured based on the operation of these pressure-sensitive switches.

However, because this conventional device employs a pressure-sensitive switch and because both the lens holder and lens table hold the glasses imperfectly, the measurer always has to hold the glasses in place using the pressure-sensitive switch described above. The disadvantage is that you have to keep holding it by hand to keep pressing it.

Also, the shape of the eyeglass frame (especially the shape of the front part)
, the refractive characteristics of the lens fitted into it (especially the characteristics of lenses with a strong spherical power or prism lenses), and the distance between the optical centers of the left and right lenses, which corresponds to the pupillary distance of the person wearing the glasses, etc. Due to various factors in the construction of the glasses, when performing alignment adjustment to align the measurement optical axis of the lens meter with the optical center of the lens to be tested, glasses that do not allow the pressure-sensitive part to be pressed with the lens frame on the opposite side that has not been aligned. Therefore, it could not necessarily be called a completely automatic judgment device.

Purpose and Subject The first object of the present invention is to provide a novel and useful lens meter test lens determination device.

A second object of the present invention is to provide a lens meter test lens determination device that eliminates the drawbacks of the conventional devices described above and eliminates the need for the measurer to hold and press the glasses at all times.

A third object of the present invention is to provide a test lens determination device for a lens meter that allows free alignment adjustment.

The structural feature of the present invention for achieving the above object is that the lens holder has a vertically upward lens holder and measures the refractive characteristics of a lens to be tested of eyeglasses placed on the lens holder. a pair of holding means arranged horizontally across the lens holder and working together with the lens holder to hold the left and right parts of the eyeglasses from below; a detection means provided on a pair of holding means for photoelectrically detecting the lenses of the eyeglasses, and a detection signal from the detection means to determine whether the test lens of the eyeglasses placed on the lens holder is for the right eye; There is a determination device for a lens to be tested in a lens meter, which includes a determining means for determining whether the lens is for the left eye or for the left eye, and a notifying means for notifying the measurer of the determination result of the determining means.

With this configuration, according to the present invention, when measuring the lens of eyeglasses, it is possible to automatically determine whether the lens to be tested is for the right eye or the left eye. It is possible to provide a new and useful lens meter test lens determination device that does not require continuous holding and pressing by hand.

In addition, alignment can be adjusted freely, and
It is possible to provide a test lens determination device for a lens meter that does not cause failure or error in determining the test lens due to the lens shape or the like during alignment adjustment.

Embodiments Hereinafter, the present invention will be explained with reference to figures showing preferred embodiments thereof. FIG. 1 is an external perspective view of an automatic lens meter incorporating the test lens determining device of the present invention.

This lens meter has a CRT display section 11 that displays the measurement results of the lens to be tested, alignment status, cylinder axis direction, etc. graphically and numerically on the upper front surface of the housing 10, and has a built-in measurement optical system approximately in the center of the front surface. A lens holder 13 for holding the lens L to be tested is provided vertically above the lens holder 12. Further, the lens table 14, which cooperates with this lens holder 13 to hold the lens L or glasses G to be tested and to regulate its position, is arranged so that the lens holder 13 is located approximately at the center in the longitudinal direction. It is provided. The lens table 14, whose longitudinal direction is aligned with the horizontal direction, is configured such that its table surface can be moved forward and backward by rotating a handle 15 attached to the side surface of the housing 10. This lens meter has a built-in measuring device disclosed in, for example, Japanese Patent Application Laid-Open No. 57-199933, and automatically measures the refractive characteristics of the lens L to be tested.

FIG. 2 is a partial longitudinal sectional view showing the configuration of the determination device according to the present invention. Lens table 14 is attached to shaft 20. Shaft 20
is slidably inserted in the axial direction of a bearing 21 formed in the housing 10. A rack gear 22 is attached to the lower side surface of the shaft 20, and a pinion gear 24 attached to a rotating shaft 23 of the handle 15 meshes with the rack gear 22. As a result, when the handle 15 is rotated, the shaft 20 is moved back and forth, thereby allowing the lens table 14 to be moved back and forth.

On the table surface 14a of the lens table 14,
A lens holder 13 is disposed in the center, and detection devices 30 and 31 (detection means) for detecting lenses of eyeglasses are disposed on both sides of the lens table in the longitudinal direction of the lens table. The detection device 30 is located on the table surface 14
It has element storage parts 32 and 33 protruding from a as a holding means, and an infrared light emitting element 40 is installed in the element storage part 32, and an infrared light emitting element 41 is installed in the other element storage part 33. table 14
They are configured to face each other in a direction substantially perpendicular to the longitudinal direction of. Note that the detection device 31 (see FIG. 1) also has the same configuration as the above-mentioned detection device 30,
The element housing parts 34 and 35 each contain a light emitting element 4.
2. A light receiving element 43 is incorporated (not shown).

FIG. 3 is a block diagram showing an electric circuit of the determination device (determination means) of the present invention. Scanning circuit 50
is composed of a counter and a decoder, and receives clock pulses from an oscillator 51 to scan so as to drive the light emitting element drivers 52 and 53 alternately. The light-emitting element driver 52 is connected to the light-emitting element 40, and the driver 53 is connected to the light-emitting element 42, and the light-emitting elements 40 and 42 are caused to emit light by their respective drives.

The infrared light from the light emitting elements 40 and 42 is transmitted to the light receiving element 4.
The light is received at 1 and 43, respectively. light receiving element 41,
43 is connected to an analog switch 54,
This analog switch receives a scanning signal from a scanning circuit and is scanned in synchronization with the light emission of the light emitting elements 40 and 42. For example, when the light emitting element 40 is emitting light, the output of the light receiving element 41 paired with it is scanned. The signal is supplied to an amplifier 55. The amplifier 55 includes a light receiving element 4
The outputs of 1 and 43 are alternately supplied in synchronization with the clock pulse of the oscillation circuit 51. The output amplified to an appropriate level by the amplifier 55 is input to one input terminal of an averaging circuit 56 and a comparison circuit 58. The averaging circuit 56 averages input signals for a certain period of time, and requires a sufficiently long time compared to the scanning frequency of the light emitting elements 40 and 42.

The voltage divider 57 divides the output of the averaging circuit 56 and supplies it to the other input terminal of the comparison circuit 58. This input in the comparison circuit 58 acts as a reference level for comparison, and is influenced by the influence of external light on the light receiving element. Reduce. Comparison circuit 58 compares the amplitude of the output of amplifier 55 and the amplitude of the output of voltage divider 57 and inputs the binarized output to determination circuit 59 . A scanning signal from the scanning circuit 50 is input to this determination circuit 59. For example, when an odd-numbered scanning signal is input, a signal is received from the comparison circuit 58 and the light receiving element 4
1, and conversely, when an even-numbered scanning signal is input, a signal is received from the comparison circuit 58 and it is determined that the signal is caused by the light receiving element 43. Judgment circuit 5
The determination signal from 9 is input to a character display circuit 60. When the determination circuit determines that the character display circuit 60 is "right",
For example, the letter character “R” meaning “right”
, or “L” when it is determined to be “left”.
Scanning information for display on the CRT display 11 is supplied.

Next, the operation of the above embodiment will be explained. When, for example, the left lens L of the glasses G is placed on the lens holder, the right lens frame or lens R reduces the amount of light received by the light receiving element 41 from the light emitting element 40. This output reduction is input to the determination circuit as a signal from the comparison circuit 58. Since the scanning signal from the scanning circuit 50 is an odd-numbered one, the determination circuit 59 determines that the lens under test is the left eye lens L, outputs this result to the character display circuit 60, and displays the result on the CRT display 11. Display “L”. When the lens to be tested is a right-eye lens R, on the contrary, the amount of light received by the light-emitting element 43 is reduced by the left-eye lens L or its lens frame, and the change is detected as a signal from the comparison circuit 58 by the determination circuit. 59. At this time, since the scanning signal from the scanning circuit 50 is an even-numbered one, the determination circuit 59 determines that the lens to be tested is a right-eye lens R, and displays "R" on the CRT display 11 via the character display circuit 60. Display.

In addition, in this embodiment, the element housing part 33 having the light emitting element 40 and the element housing part 35 having the light emitting element 42 are made to protrude from the table surface 14a, so that they can be used as holding members to hold the lens R or L of the glasses G. The eyeglasses G can be reliably held even when the measurer takes his hands off the eyeglasses G by cooperating with the known lens holder 200 during lens measurement. Also,
Since lens and frame detection is non-contact detection, even if the side of the lens that is not adjusted is slightly shifted during alignment adjustment, the detection ability will not be affected.

Further, if the element storage parts 33 and 35 are configured to be movable up and down via elastic members such as springs, it is more effective to hold the lens frame.

As explained above, the present invention has a structure in which the left and right parts of the glasses are held by the lens holder and one of the pair of holding means, and the holding means is provided with a photoelectric detection means. Therefore, there is no need for the measurer to keep holding the glasses with his or her hands during measurement, unlike in the past, and the glasses are reliably held in a predetermined position even when the user's hands are removed.

In addition, since the left and right parts of the glasses are held by the lens holder and one of the pair of holding means, the lenses of the glasses can be placed at predetermined positions in the measurement optical path, allowing accurate measurement. It can be performed.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing an example of a lens meter incorporating a test lens determination device according to the present invention;
FIG. 2 is a partial vertical sectional view showing one embodiment of the determination device, and FIG. 3 is a block diagram showing the electric circuit of the determination device. 13... Lens pedestal, 14... Lens table, {40, 42... Light emitting element, 41, 43...
light receiving element} (detection means), 59...judgment circuit, 11
...CRT display (notification means), G...glasses.

Claims (1)

[Claims for Utility Model Registration] (1) A device having a vertically upward lens holder and used in a lens meter that measures the refractive characteristics of a test lens of eyeglasses placed on the lens holder. A pair of holding means arranged horizontally with the lens holder in between and working together with the lens holder to hold the left and right parts of the eyeglasses from below; and a pair of holding means provided on the pair of holding means. A detection means for photoelectrically detecting the lens of the eyeglasses, and a detection signal from the detection means to determine whether the lens to be tested of the eyeglasses placed on the lens holder is for the right eye or for the left eye. 1. A test lens determining device for a lens meter, comprising: a determining means for determining whether there is a lens; and a notifying means for notifying a measurement person of the determination result of the determining means. (2) The lens holder is configured such that its holder is vertically upward, the table surface of the lens table is a vertical surface, and the longitudinal direction of the lens table is horizontal. A test lens determination device for a lens meter according to claim 1, characterized in that the utility model is registered as claimed in claim 1. (3) A utility model characterized in that the detection means is constituted by a light-emitting element and a light-receiving element that are arranged facing each other at a predetermined interval on a directional line that intersects the longitudinal direction of the lens table. A test lens determination device for a lens meter according to claim 1 or 2. (4) A request for registration of a utility model characterized in that the light-emitting element or the light-receiving element is provided in an element accommodating part protruding from the table surface of a lens table, and the element accommodating part also serves as a holding means for holding glasses. A test lens determination device for a lens meter according to item 3. (5) The utility model according to any one of claims 1 to 4, wherein the notification means is an image display means that displays a character meaning "right" or "left." Lens meter test lens determination device.