JPH06207815A - Frame pd measuring apparatus - Google Patents

Abstract

PURPOSE:To achieve accurate measurement of a distance between optical centers (frame PD) in the direction of a visual line in the operation for a bag by measuring a moving value of an observation unit when a control target line synthesized in the course of an optical path overlap a target line passing through a lens to be inspected. CONSTITUTION:When a target 15 and a target for control both the same in the shape to be lighted with a light source arranged in an observation optical path of an observation unit 13, light of the target 15 is transmitted through a framed glasses lens as supported with a holding section 5 movable longitudinally and vertically and reaches an observation window 14 via a mirror and a half mirror. On the other hand, the light of the target for control reaches the observation window almost directly and both the light is combined to enter eyes of an observer simultaneously. When a lens only having a spherical refracting power is used, the unit 13 is moved so that a target reference line (solid line) viewed through the lens overlaps a target reference line (dotted line) for control viewed directly. Thus, a graduation of a guide bar 11 here id given as a single eye PD to determine a frame PD by measuring right and left graduations.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame PD for measuring a distance between optical centers of spectacle lenses framed in a spectacle frame.
The present invention relates to a measuring device.

[0002]

2. Description of the Related Art Conventionally, a distance between optical centers of lenses framed in a spectacle frame (this distance is referred to as frame PD in this specification).
Is abbreviated as "), and a marking point mark is applied to the optical center searched by a lens meter, and the distance between the left and right marking point marks is measured by a scale or the like. Further, recently, instead of measuring with a scale, a method of moving the frame together with the contact member and electrically detecting the amount of movement of the contact member when measuring the optical centers of the left and right lenses is also known. Has been.

[0003]

By the way, since the shape of the head is rounded, the spectacle frame is generally designed to have a curve. When such a spectacle frame inserted in the spectacle frame is actually worn, a deviation occurs between the visual axis direction and the optical axis direction of the lens. FIG. 1 illustrates this state. To detect the optical center in the above-described measurement of the frame PD, the left and right lenses are placed on the nosepiece of the lens meter, and the rear surface of the lens contacts the nosepiece. The frame PD tends to be the distance between the optical axes in (a) because it is performed in the state of being in contact with each other, and an error is likely to occur in terms of measuring the distance between the optical axes in the visual axis direction (b). Met. Moreover, these frame curves have been diversified in recent years, and some of them have a large curve value, and their error tends to increase. In view of the above-mentioned drawbacks of the conventional technique, it is an object of the present invention to provide a device capable of accurately measuring the frame PD in the visual axis direction in the wearing state.

[0004]

In order to solve the above problems, the present invention is characterized by having the following configuration. (1) In a frame PD measuring device for measuring a distance between optical centers of lenses framed in a spectacle frame, the spectacles are arranged such that a visual axis direction in a state where the spectacle frame is worn is parallel to an observation optical axis. A frame holding part for holding a frame, a first observation system for observing a first target arranged in front of the lens, and a second target for synthesizing an optical path in the middle of an optical path of the first observation system. An observation optical system including two observation systems, and a first lens for moving the framed lens relative to the optical axis of the observation optical system for superimposing and observing the first and second targets. Moving means, measuring means for measuring the amount of movement of the moving means, and second moving means for moving the framed lens relative to the first target surface along the optical axis of the observation optical system, Be equipped with Is characterized by.

(2) The first and second targets in (1) are characterized by having rotating means that rotate in synchronization with each other.

[0006]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is an external perspective view of the frame PD measuring apparatus of this embodiment. Reference numeral 1 is a base of the apparatus, and a guide groove 2 is provided on the upper surface of the base 1 in the front-rear direction. Three
Is a support shaft which is guided by the guide groove 2 and is moved back and forth by a feed screw (not shown). Support shaft 3
Supports a holding part 5 for holding the spectacle frame by a knob 6 so as to be vertically movable. The holding portion 5 has a peripheral support portion 7 that supports the ear sides of the left and right glasses and a nose pad member 8. Reference numeral 9 is a knob for adjusting the relative height between the peripheral support portion 7 and the nose pad member 8. On the other hand, two pillars 10 are vertically provided on the base 1 and hold two upper and lower guide rods 11 and 12 in parallel. A scale from the center of the nose pad member 8 is engraved in the longitudinal direction of the guide rod 11. Reference numeral 13 is a U-shaped observation unit, which has an observation optical system inside. The observation unit 13 is guided by the guide rods 11 and 12 and is movable left and right. An observation window 14 is provided with a cross marker in consideration of parallax. The lateral movement of the observation unit 13 can be measured by the scale. Reference numeral 15 is a straight-line target (comprising a plurality of straight lines as described later). Reference numeral 16 is a knob for rotating the direction of the target.

Next, the observation optical system in the observation unit 13 will be described with reference to FIG. FIG. 3 is a schematic view of the observation optical system viewed from the side. A target 15 and a reference target 15 '(illuminated by a light source (not shown)) having the same shape as that of the target 15 are arranged in the observation optical path, and the direction of the target 15 is synchronously rotated by a knob 16 via a timing belt or a gear. The target 15 has a reference line for measurement and a plurality of lines parallel to the reference line, and the reference line of the target 15 and the line of the reference target 15 'are located on the same straight line. The light from the target 15 is the subject lens 2
After refracting through 1, the light is reflected by the mirror 22 and the half mirror 23 and reaches the measurement eye 24 through the observation window 14 (optical path 1). Further, the light of the reference target 15 'passes through the half mirror 23, passes through the observation window 14 and reaches the measurement eye 24 (optical path m). The reason why the observing eye can simultaneously view the target 15 and the reference target 15 'when the lens is placed in the optical path will be described. FIG. 4 shows the relationship between the target image position from the lens and the lens power when the lens is placed at a position L away from the target 15. In FIG. 3, target 15 to mirror 22
Distance between mirrors is 150 mm, mirror 22 to half mirror 2
When the distance to 3 is 80 mm and the distance from the reference target 15 'to the observation eye is 300 mm, the adjustment amount (Diopter value) necessary to see the image of the target 15 (on the optical axis) through the lens to be inspected. And the target for reference 15
The difference from the adjustment amount required for viewing ′ (on the m optical axis) is shown in FIG. 5 in units of diopters. It is difficult to see the two targets overlaid if the difference in diopter is too large, and the figure shows the practical range. FIG. 6 shows the image magnification when the image of the target 15 is observed through the lens to be inspected. For example, when observing a + 10D plus lens at a magnification of 2, the distance between the lens and the target may be set to 50 mm from FIG. The diopter difference at this time is 1D difference from FIG. 5, and both targets can be sufficiently viewed at the same time. The further the observation positions are, the smaller the diopter difference becomes. Figure 5,
It can be seen from FIG. 6 that if the degree of the minus lens is strong, the lens is brought closer to the target 15 to bring the image magnification closer to 1, thereby facilitating the observation, and if the degree of the plus lens is made strong, the magnification is similarly brought closer. Can be kept low and the diopter difference at the time of observation can be made small to facilitate observation. On the contrary, with a weak lens, it becomes easier to observe by moving away from the lens. By operating the knob 6 in FIG. 2 to move the frame holding unit 5 up and down, and by adjusting the eye height position, it is possible to select an appropriate magnification and diopter difference. FIG. 7 shows how the target looks in the concave lens (a), the convex lens (b) and the progressive lens (c). As described above, the knob 6 is operated to set the frame holding unit 5 at an appropriate position with respect to the target.

In the apparatus having the above structure, the frame
The measurement of the PD will be described. When the spectacle lens has only a spherical refractive power, the target reference line (optical path 1) seen through the lens to be inspected and the reference target reference line directly seen are the positions passing through the optical center as shown in (a) of FIG. And connect in a straight line. When observed as shown in (a) of FIG. 7, the observation unit 13 is moved (the target reference line is shown by a solid line and the reference target reference line is shown by a dotted line), and the position where the target lines are connected in a straight line is set. The one-eye PD centering on the nose pad can be obtained by reading from the scale of the guide rod 11. The right and left are obtained, and the sum of the two becomes the frame PD. Next, the frame P of the astigmatic lens
A method of obtaining D will be described. The image of the target 15 tilts due to the astigmatic power of the lens to be inspected,
It does not match the direction of ´. The target 15 and the reference target 15 'are rotated synchronously so that the directions of both lines are parallel to each other, and then the measurement is performed in the same manner as the spherical lens.
Next, the measurement of the frame PD such as the near portion of the progressive lens will be described. In the progressive lens, the astigmatic diopter and the astigmatic axis direction are optically constant regardless of whether the distance portion or the near portion has a difference in addition diopter. Since the device can observe almost the entire frame, the frame PD is measured from the positional relationship between the distance portion and the near portion. FIG. 8 is a diagram for explaining the measurement of the progressive lens, where the solid line represents the reference line of the target 15 and the dotted line represents the reference line of the reference target 15 '. In the case of the right eye lens, when the reference line of the target 15 passes through the distance portion, it is observed as (A), and when it passes through the near portion, it is observed as (B). The near and far frame PD can be obtained by obtaining the measured values at each position.

The above embodiment can be variously modified. By configuring the observation window with a transmissive liquid crystal panel,
The same pattern can be easily presented as a marker on the vertical line of the reference target. Further, since the pattern can be freely changed by configuring the target 15 and the reference target 15 'with liquid crystal panels, the mechanism for rotating both targets in synchronization can be omitted. Also,
It is an easy modification to electrically detect the movement amount of the observation unit and digitally display it.

[0010]

According to the present invention, the frame PD in the visual axis direction in the worn state can be accurately measured.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating a shift between a visual axis direction of a spectacle lens and an optical axis direction of the lens.

FIG. 2 is an external perspective view of a frame PD measuring device according to the present embodiment.

FIG. 3 is a schematic side view of an observation optical system in the observation unit.

FIG. 4 is a diagram showing a relationship between a target image position from a lens and a lens power when the lens is placed at a distance L from the target.

FIG. 5 is a diagram in which a difference between an adjustment amount required to see an image of a target under a predetermined condition and an adjustment amount required to see an image of a reference target is represented by a diopter value.

FIG. 6 is a diagram showing image magnification when observing an image of a target through a lens to be inspected.

FIG. 7 is a diagram showing how a target looks in a concave lens (a), a convex lens (b), and a progressive lens (c).

FIG. 8 is a diagram illustrating measurement of a progressive lens.

[Explanation of symbols]

 1 Base 2 Guide Groove 3 Support Shaft 4 Back-and-Forth Knob 5 Holding Part 6 Knob 7 Peripheral Support Part 8 Nose Pad Member 9 Knob 10 Supports 11, 12 Guide Rod 13 Observation Unit 14 Observation Window 15 Target 16 Knob

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[Procedure amendment]

[Submission date] October 29, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is an external perspective view of the frame PD measuring apparatus of this embodiment. Reference numeral 1 is a base of the apparatus, and a guide groove 2 is provided on the upper surface of the base 1 in the front-rear direction. Three
Is a support shaft which is guided by the guide groove 2 and is moved back and forth by a feed screw (not shown). Support shaft 3
Supports a holding part 5 for holding the spectacle frame by a knob 6 so as to be vertically movable. The holding portion 5 has a peripheral support portion 7 that supports the ear sides of the left and right glasses and a nose pad member 8. Reference numeral 9 is a knob for adjusting the relative height between the peripheral support portion 7 and the nose pad member 8. On the other hand, two pillars 10 are vertically provided on the base 1 and hold two upper and lower guide rods 11 and 12 in parallel. A scale from the center of the nose pad member 8 is engraved in the longitudinal direction of the guide rod 11. Reference numeral 13 is a U-shaped observation unit, which has an observation optical system inside. The observation unit 13 is guided by the guide rods 11 and 12 and is movable left and right. An observation window 14 is provided with a cross marker in consideration of parallax. The lateral movement of the observation unit 13 can be measured by the scale. Reference numeral 15 denotes a linear target (consisting of at least one straight line). Reference numeral 16 is a knob for rotating the direction of the target.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

Next, the observation optical system in the observation unit 13 will be described with reference to FIG. FIG. 3 is a schematic view of the observation optical system viewed from the side. A target 15 and a reference target 15 '(illuminated by a light source (not shown)) having the same shape as that of the target 15 are arranged in the observation optical path, and the direction of the target 15 is synchronously rotated by a knob 16 via a timing belt or a gear. If it is not an astigmatic lens, the standard line of the target 15 and the line of the reference target 15 'are located on the same straight line. The light from the target 15 is the subject lens 2
After refracting through 1, the light is reflected by the mirror 22 and the half mirror 23 and reaches the measurement eye 24 through the observation window 14 (optical path 1). Further, the light of the reference target 15 'passes through the half mirror 23, passes through the observation window 14 and reaches the measurement eye 24 (optical path m). The reason why the observing eye can simultaneously view the target 15 and the reference target 15 'when the lens is placed in the optical path will be described. FIG. 4 shows the relationship between the target image position from the lens and the lens power when the lens is placed at a position L away from the target 15. In FIG. 3, target 15 to mirror 22
Distance between mirrors is 150 mm, mirror 22 to half mirror 2
When the distance to 3 is 80 mm and the distance from the reference target 15 'to the observation eye is 300 mm, the adjustment amount (Diopter value) necessary to see the image of the target 15 (on the optical axis) through the lens to be inspected. And the target for reference 15
The difference from the adjustment amount required for viewing ′ (on the m optical axis) is shown in FIG. 5 in units of diopters. It is difficult to see the two targets overlaid if the difference in diopter is too large, and the figure shows the practical range. FIG. 6 shows the image magnification when the image of the target 15 is observed through the lens to be inspected. For example, when observing a + 10D plus lens at a magnification of 2, the distance between the lens and the target may be set to 50 mm from FIG. The diopter difference at this time is 1D difference from FIG. 5, and both targets can be sufficiently viewed at the same time. The further the observation positions are, the smaller the diopter difference becomes. Figure 5,
It can be seen from FIG. 6 that if the degree of the minus lens is strong, the lens is brought closer to the target 15 to bring the image magnification closer to 1, thereby facilitating the observation, and if the degree of the plus lens is made strong, the magnification is similarly brought closer. Can be kept low and the diopter difference at the time of observation can be made small to facilitate observation. On the contrary, with a weak lens, it becomes easier to observe by moving away from the lens. By operating the knob 6 in FIG. 2 to move the frame holding unit 5 up and down, and by adjusting the eye height position, it is possible to select an appropriate magnification and diopter difference. FIG. 7 shows how the target looks in the concavo-convex lens (a), the astigmatic lens (b) and the progressive lens (c). Notational target standard
Is indicated by a solid line and the reference target reference line is indicated by a dotted line.
You As described above, the knob 6 is operated to set the frame holding unit 5 at an appropriate position with respect to the target.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

In the apparatus having the above structure, the frame
The measurement of the PD will be described. When the spectacle lens has only spherical refractive power, the target reference line (optical path 1) seen through the lens to be inspected and the reference target reference line directly seen are observed as shown in FIG. this
In this case, the observation unit 13 is moved (the target reference line is shown by a solid line and the reference target reference line is shown by a dotted line), and the two target lines are connected to each other on a straight line.
Is a position that passes through the optical center, and this position can be read from the scale of the guide rod 11 to obtain the one eye PD centered on the nose pad. Seeking the left and right, the sum of the two is the frame P
It becomes D. Next, how to obtain the frame PD of the astigmatic lens will be described. The image of the target 15 tilts due to the astigmatic power of the lens to be inspected, and does not match the orientation of the reference target 15 '. The target 15 and the reference target 15 'are rotated synchronously so that the directions of both lines are parallel to each other, and then the measurement is performed in the same manner as the spherical lens. Next, the measurement of the frame PD such as the near portion of the progressive lens will be described.
In the progressive lens, the astigmatic diopter and the astigmatic axis direction are optically constant regardless of whether the distance portion or the near portion has a difference in addition diopter. Since the device can observe almost the entire frame,
The frame PD is measured from the positional relationship between the distance portion and the near portion. FIG. 8 is a diagram for explaining the measurement of the progressive lens, where the solid line represents the reference line of the target 15 and the dotted line represents the reference line of the reference target 15 '. In the case of the right eye lens, when the reference line of the target 15 passes through the distance portion, it is observed as (A), and when it passes through the near portion, it is observed as (B). The near and far frame PD can be obtained by obtaining the measured values at each position.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating a shift between a visual axis direction of a spectacle lens and an optical axis direction of the lens.

FIG. 2 is an external perspective view of a frame PD measuring device according to the present embodiment.

FIG. 3 is a schematic side view of an observation optical system in the observation unit.

FIG. 4 is a diagram showing the relationship between the target image position from the lens and the lens power when the lens is placed at a position L away from the target.

FIG. 5 is a diagram in which a difference between an adjustment amount required to see an image of a target under a predetermined condition and an adjustment amount required to see an image of a reference target is represented by a diopter value.

FIG. 6 is a diagram showing image magnification when observing an image of a target through a lens to be inspected.

[FIG. 7] Concavo-convex lens (a), astigmatism lens (b) , and
It is a figure showing how a target looks in a progressive lens (c).

FIG. 8 is a diagram illustrating measurement of a progressive lens.

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 7

[Correction method] Change

[Correction content]

[Figure 7]

Claims (2)

[Claims] 1. In a frame PD measuring device for measuring a distance between optical centers of lenses framed in a spectacle frame, a visual axis direction in a state where the spectacle frame is worn is parallel to an observation optical axis. A frame holding unit for holding a spectacle frame, a first observation system for observing a first target arranged on the front side of the lens, and a second target having a combined optical path in the optical path of the first observation system. And an observation optical system including a second observation system, and the framed lens is moved relative to the optical axis of the observation optical system in order to observe the first and second targets in an overlapping manner. First moving means, measuring means for measuring the amount of movement of the moving means, and second moving means for moving the framed lens relative to the first target surface along the optical axis of the observation optical system. And A frame PD measuring device characterized in that 2. The frame PD measuring device according to claim 1, wherein the first and second targets have rotating means that rotate in synchronization with each other.