JP2000028478A - Lens meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lens meter by which the P.D. value between the right-eye lens and the left-eye lens of glasses to be inspected can be measured by measuring the pupil distance, of the glasses to be inspected, obtained on the basis of the position detection result of a contact member with the glasses, capable of being moved to the direction of the pupil distance up to a position, in which the left-eye lens is refracted and measured, from a position in which the right-eye lens is refracted and measured. SOLUTION: Glasses S are pressed to a cradle 1, their parallelism with the cradle 1 is detected, and a left lens A and a right lens B are placed on a nosepiece 2 at the upper end of a measuring part. The glasses S are moved back and forth by a cradle movement lever, and the glasses S can be moved right and left. A wear plate 5 is held integrally by a movement member 6 which can be moved relatively only to the longitudinal direction of the cradle 1. One side of a sliding brush 7 is slid on a linear resistor 8, and the other side is slid on a conductor. A voltage which is changed due to its sliding operation is amplified, and it is converted by an A/D converter so as to be sent to a CPU. Voltages in positions before and after the movement of the sliding brush 7 are differentiated, and they are converted by the CPU into the distance between optical centers of the lenses A, B so as to be displayed on a display part as a P.D. value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens meter for measuring the refractive index and the like of a spectacle lens, and in particular, to the distance between the optical centers of two lenses on the right and left of the spectacle, that is, the so-called P.O. It relates to a mechanism for measuring the D value.

[0002]

2. Description of the Related Art Recently, in a lens meter for measuring a refractive index of a spectacle lens, a distance between an optical center between spectacle lenses,
The so-called binocular P. Devices that can simultaneously measure the D value have become widespread. For example, US Patent Publication USP40
No. 98002 is known.

In the above publication, as described in detail in FIG. 1 of this publication, one of a pair of pads resembling a human nose is applied to a nose of a pair of eyeglass frames, and the pads are slid finely. For detecting the position of the nose of the nose. By measuring both pads, the so-called binocular P.I. The D value is determined.

[0004]

However, the P.M. The D measuring device has the following difficulties.

[0005] That is, the so-called unilateral P. In order to measure the D value, the spectacles must be pressed against the pad from the near side, then removed from the pad after the measurement, the spectacles must be moved, pressed against the other pad, measured, and then removed again. It takes time and is inconvenient.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and has a very simple operation method. D
A technical object is to provide a lens meter capable of measuring a value.

[0007]

Means for Solving the Problems In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) In a lens meter that photoelectrically detects a light beam transmitted through a lens to be inspected and measures refraction of the lens to be inspected, at least the right eye lens of the eyeglasses to be inspected is refraction measured. An eyeglass abutment member movable in the interpupillary direction from a position to a position where the left eye lens of the eyeglass of the eyeglass is refraction-measured; a detecting means for detecting a position of the eyeglass abutment member; Measuring means for measuring the interpupillary distance of the eyeglasses based on the amount of movement of the eyeglass contact member obtained based on the result.

[0009]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing the entire lens meter. The spectacles S are pressed against the cradle 1 and the degree of parallelism with the cradle 1 is obtained, and the lens is placed on the nosepiece 2 which is the contact portion at the upper end of the measuring unit. The cradle 1 can be moved forward and backward by the cradle moving lever 3, and the glasses S can be moved forward and backward. In addition, the glasses S can be moved left and right by being moved left and right while being pressed against the receiving table 1. At this time, by moving the spectacles S while looking at the positioning screen 4, when the optical center of the spectacle lens coincides with the measurement optical axis of the lens meter, the image of the light emitting diode comes to the center of the screen 4. Can be aligned on one side.

[0011] The backing plate 5 is configured to receive the pedestal 1 by a configuration described later.
And slides on the outer side of the glasses S.

FIG. 2 is a partial sectional view of the glasses S of FIG. 1 as viewed from above.

S is a pair of glasses, and A and B are a right-eye lens and a left-eye lens, respectively. The optical center of the right-eye lens A is located at the center of the nosepiece 2. Backing plate 5
Is in contact with the left side of the glasses S. This is a result of the positioning of the right-eye lens A by moving the cradle 1 and the contact plate 5 while pressing the contact plate 5 against the glasses S with the finger of the left hand and watching the screen 4. As shown in FIG. 4, the backing plate 5 is engaged with the back surface of the cradle 1 and is integrally held by a sliding member 6 that can relatively move only in the longitudinal direction of the cradle 1. The sliding member 6 holds a sliding brush 7 at one end. One of the sliding brushes 7 slides on a linear resistor 8 held on the back of the cradle 1, and the other slides on a conducting wire 11 held in parallel with the linear resistor 8. Reference numeral 9 denotes a slide shaft for moving the receiving table 1 in the front-rear direction, and reference numeral 10 denotes a cable connected to the linear resistor 8 and the conductor 11.

FIG. 3 is a view in which the eyeglasses S and the backing plate 5 are integrally slid to the right by a finger, and the optical center of the left-eye lens B is aligned with the center of the nosepiece 2. The sliding brush 7 moves integrally with the backing plate 5 by the distance between the optical centers of the left and right spectacle lenses A and B.

FIG. 4 shows a state of engagement between the slide member 6 for integrally holding the backing plate 5 and the receiving table 1, and FIG.
FIG. 5 is a block diagram showing the electrical configuration of this embodiment. As described above, the sliding brush 7 is 2
One slides on the linear resistor 8 and the other slides on the conductor 11. The voltage changed by this sliding is amplified by the amplifier 12 and then converted into a digital signal by the A / D converter 13 and sent to the CPU 14. A read switch 15 is provided before and after the sliding brush 7 moves.
At the same time, the voltage at that position is detected, and the difference between the voltages is converted by the CPU 14 into the distance between the optical centers of the left and right eyeglass lenses A and B. For example, 64.
It is displayed on the display unit 16 as 5 mm.

The case where the distance between the optical centers of the left and right spectacle lenses A and B is detected by the electric resistance value has been described above. However, the detection method is not limited to this, and various methods such as those using an encoder can be adopted. Needless to say.

[Other Embodiment] Another embodiment will be described with reference to FIG. FIG. 6 is a partial sectional view of the glasses S of FIG. 1 as viewed from above, similarly to FIG.

S is a pair of glasses, and A and B are a right-eye lens and a left-eye lens, respectively. Reference numeral 1 denotes a cradle, which holds a graduated reference lever 17 which can slide along the cradle 1 therein. Reference numeral 5 denotes a backing plate, which is not a sliding brush 7 as in the previous embodiment, but is integrated with an index 18 as shown in the figure and slides on the receiving table 1 separately from the reference lever 17. FIG. 6 shows a case where the optical center of the right-eye lens A coincides with the center of the nosepiece 2.

A method for measuring the distance between the optical centers of the spectacle lenses A and B will be described below.

After aligning the optical center of the right-eye lens A of the glasses S with the optical axis center of the lens meter (the center of the nosepiece 2) while watching the screen 4, the reference lever 17
Is moved, and the index 18 integrated with the backing plate 5 is moved.
To the scale 0 of the reference lever 17. Thereafter, only the contact plate 5 in contact with the spectacles S is moved together with the spectacles S, and the optical center of the left-eye lens B is aligned with one center of the optical axis of the lens meter (the center of the nosepiece 2). At this time, the scale indicated by the index 18 indicates the left and right magnifying lenses A and B.
P. between It becomes the D value.

[0021]

As described above, according to the lens meter of the present invention, the P.V. The D value can be measured.

[Brief description of the drawings]

FIG. 1 illustrates a lens meter according to an embodiment of the present invention. It is a perspective view showing a D measuring device.

FIG. 2 is a partial cross-sectional view of the glasses of FIG. 1 as viewed from above, and shows the glasses before movement.

FIG. 3 is a view showing a state after movement of the glasses in FIG. 2;

FIG. 4 is a view C of FIG. 2 showing a state of engagement between the cradle and the backing plate;
It is -C sectional drawing.

FIG. 5 is a block diagram showing an electrical configuration of the measuring device.

FIG. 6 is a partial cross-sectional view showing the eyeglasses of FIG. 1 as viewed from above, according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Receiving stand 2 ... Nose piece 3 ... Receiving stand moving lever 4 ... Screen for positioning 5 ... Backing plate 6 ... Sliding member 7 ... Sliding brush 8 ... Linear resistor 9 ... Slide shaft 11 ... Conductor 17 ... Reference Lever 18: Index A: Right eye lens B: Left eye lens S: Eyeglasses

Claims (1)

[Claims] 1. A lens meter for photoelectrically detecting a light beam transmitted through a lens to be measured and measuring refraction of the lens to be measured, at least a position where a right eye lens of the eyeglasses to be abutted is measured for refraction. An eyeglass contact member movable in the interpupillary direction from a position to a position where the left eye lens of the eyeglass to be refracted is measured, detection means for detecting the position of the eyeglass contact member, and the detection result Measuring means for measuring the interpupillary distance of the subject's eyeglasses based on the amount of movement of the subject's eyeglass contact member obtained based on the lens meter.