JP2007333727A - Instrument for measuring refractive index - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the adhesion of stain to measurement members used for measuring the refractive index of a lens material. <P>SOLUTION: This instrument 1 for measuring refractive index is used to measure the refractive index of the lens material in which the measurement members 100 each including a gel body 110 fitted to the front surface La and the rear surface Lb of a lens L to be inspected are used. The instrument 1 comprises measurement member holding parts 2B, 3B for so holding both measurement members 100 that the fitted surface of the gel body 110 fitted to the front surface La faces the fitted surface of the gel body 110 fitted to the rear surface Lb and arms 2, 3 and a rotating shaft 4 for so relatively moving the measurement member holding parts 2B, 3B as to change the interval of the fitted surfaces of the both gel bodies 110. A refractive index is measured by a lens meter 1000 with the lens L to be inspected held by the gel bodies 110 of the measurement members 100 held by the measurement member holding parts 2B, 3B. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a refractive index measuring instrument used for measuring the refractive index of a lens material.

  In recent years, the demand for thinner and lighter spectacle lenses is increasing in consideration of the wearing feeling of spectacles. In a thin and light spectacle lens, a material having a high refractive index is used in order to obtain a refractive power equivalent to that of a thick lens. Various lens materials are used for each lens manufacturer, and different lens materials are generally used for each product even if they are the same manufacturer. As described above, lenses made of lens materials having various refractive indexes are commercially available.

  Conventionally, the refractive index of a lens material has been estimated based on a lens meter measurement value or lens thickness, but with the advent of various lens materials, it is difficult to estimate the refractive index with high accuracy. It was. In order to cope with such a situation, various lens meters having configurations for measuring the refractive indexes of various lens materials have been proposed.

  For example, in Patent Document 1, it is possible to place a mark between a measurement light source and a test lens and measure the lens power of the test lens based on the amount of variation in the image of the mark obtained through the test lens. A first lens power measurement process in which a test lens is arranged at a measurement base point of the lens meter and a first lens power of the test lens in the air is measured by the lens meter. Then, a lens to be tested, in which transparent first and second gel bodies made of the same material are in close contact with the front and back lens surfaces, respectively, is placed at the measurement reference point of the lens meter, and is sandwiched between both gel bodies in the air by the lens meter. A second lens power measurement process for measuring the second lens power of the measured lens and a calculation process for calculating the refractive index of the test lens based on the first and second lens powers. Refractive index measurement method of lens is disclosed. Further, transparent first and second plane plates are in close contact with the back surfaces of both gel bodies, and the first plane plate and the first gel are in a state where both gel bodies are in close contact with the lens to be examined. A five-layer structure is arranged in the order of the body, the lens to be examined, the second gel body, and the second plane plate, and the second lens power is measured through the five-layer structure.

JP 2005-331427 A

  However, the invention described in Patent Document 1 has the following problems. First, when configuring the above five-layer structure, bubbles may be interposed between the gel body and the flat plate, or between the gel body and the lens to be measured, resulting in a problem that measurement accuracy is lowered. It was.

  Moreover, when dirt adheres to the gel body or the flat plate (measuring member), there is a problem that the measurement accuracy of the refractive index is lowered. In particular, the gel body has a certain degree of adhesiveness so as to be in close contact with the lens to be inspected, so that it is easy for dirt to adhere, and it is not easy to remove the dirt once adhered.

  In addition, a measuring member for measuring a relatively small lens such as a spectacle lens is made relatively small in accordance with the size of the lens. For this reason, it is not easy to handle gel bodies and the like using fingers and tweezers.

  Further, after the above five-layer structure is formed, the gel body is peeled off from the flat plate or the lens to be examined, and the measurement may not be performed smoothly.

  In addition, the gel body is generally stored in a state in which a protective sheet (referred to as release paper) such as a film for protecting the adhesion surface to the lens to be examined from dirt is attached. In use, it is troublesome to remove the release paper and to stick the release paper during storage. Furthermore, when the operation of peeling or pasting the release paper is performed with a finger, dirt such as fingerprints may adhere to the gel body or the release paper. In addition, when the lens to be examined with the measurement member attached is placed on the lens meter or removed from the lens meter, dirt such as fingerprints may adhere to the gel body or the flat plate.

  The present invention has been made to solve the above problems, and provides a refractive index measuring instrument capable of suppressing the adhesion of dirt to a measurement member used for measuring a refractive index of a lens material. The purpose is to do.

  Another object of the present invention is to provide a refractive index measuring instrument capable of facilitating the handling of the measuring member.

  Another object of the present invention is to provide a refractive index measuring instrument capable of preventing a decrease in measurement accuracy of a refractive index of a lens material.

  In order to achieve the above object, the invention according to claim 1 is a first measurement member including a first contact member that is transparent, flexible, and has a known refractive index that is in close contact with one surface of the lens to be examined. And a second measurement member including a second contact member having a known refractive index that is transparent, flexible, and is in close contact with the other surface of the test lens, and a lens material for forming the test lens An instrument for measuring a refractive index used to measure the refractive index of the first contact member that is in close contact with the one surface of the lens to be tested and in close contact with the other surface A first measurement member holding portion for holding the first measurement member and a second measurement member holding for holding the second measurement member so as to face the close contact surface of the second close contact member. A contact surface of the first contact member and a contact surface of the second contact member A moving mechanism for relatively moving the first measurement member holding portion and the second measurement member holding portion so as to change the interval, and the first contact member and the second It is used for the measurement of the refractive index in a state where the test lens is sandwiched between the contact member.

  Moreover, invention of Claim 2 is the instrument for refractive index measurement of Claim 1, Comprising: The said moving mechanism part is contact | adherence of the contact | adherence surface of the said 1st measurement member, and the said 2nd measurement member. The distance between the two contact surfaces is changed while maintaining the surface substantially parallel to the surface.

  The invention according to claim 3 is the refractive index measuring instrument according to claim 2, wherein the moving mechanism portion is provided with the first measuring member holding portion at the tip, and at the distal end side. A first arm having one operating portion, a second arm having a second measuring member holding portion at the distal end, and a second operating portion on the distal end side, the first arm and the second arm A pivot shaft that connects the arms, a columnar member that extends from the first arm in a direction substantially orthogonal to the two contact surfaces, and an insertion through which the columnar member is inserted. And the first arm and the second arm rotate relative to each other about the rotation axis when the first and second operation parts are operated. And the insertion portion are relatively moved in the substantially orthogonal direction, thereby There is changed, characterized in that.

  The invention according to claim 4 is the refractive index measuring instrument according to claim 3, wherein the second arm is provided with the second measurement member holding portion at the tip, and the terminal is the end. A movable portion connected to one end of the second operation portion, wherein the second operation portion is formed into a bent shape having a protrusion protruding toward the first arm; The second arm is connected to the first arm at a portion, and when the first operation portion and the other end of the second operation portion are brought close to each other, the rotation axis is the center. One end of the second operation unit is separated from the first arm by rotation, the movable unit is separated from the first arm, the two contact surfaces are separated, and the first operation unit and the first operation unit are separated from the first operation unit. When the other end of the second operation unit is separated from the second operation unit, the second operation unit is rotated by the rotation about the rotation axis. One end of which is adjacent to the first arm, the movable portion is proximate to the first arm, the two contact surface are close, characterized in that.

  The invention according to claim 5 is the refractive index measuring instrument according to claim 4, wherein the moving mechanism section includes the first operation section and the other end of the second operation section. It includes an urging means for urging the first and second arms in the direction of separating.

  The invention according to claim 6 is the refractive index measuring instrument according to any one of claims 3 to 5, wherein the first arm is directed from the tip toward the rotating shaft. The second arm is bent in a direction away from the second arm and then bent in a direction approaching the second arm, and is connected to the second arm by the rotation shaft. Features.

  The invention according to claim 7 is the refractive index measuring instrument according to any one of claims 3 to 5, wherein the second arm is directed from the tip toward the rotating shaft. The first arm is bent in a direction away from the first arm and then bent in a direction approaching the first arm, and is connected to the first arm by the rotation shaft. Features.

  The invention according to claim 8 is the refractive index measurement instrument according to claim 1, wherein the moving mechanism unit is connected to each other by a rotating shaft and the rotating shaft, and the operation unit is connected to each other. The first measurement member holding part is provided at the tip of one of the two arms, and the second measurement member holding part is provided on the other arm. The first arm held at the first measurement member holding portion is provided at the tip, and the two arms rotate relative to the rotation shaft in response to an operation on the operation portion. The distance between the close contact surface of the measurement member and the close contact surface of the second measurement member held by the second measurement member holding portion is changed.

  The invention according to claim 9 is the refractive index measuring instrument according to claim 8, wherein the two arms are connected so as to cross each other on the rotating shaft. It is characterized by.

  The invention described in claim 10 is the refractive index measuring instrument according to claim 8, wherein the two arms have both ends of one arm positioned in the same direction with respect to the rotation axis. The other arm is connected so that both ends of the other arm are positioned in a direction opposite to the direction with respect to the rotation axis.

  An eleventh aspect of the present invention is the refractive index measuring instrument according to the eighth aspect, wherein the two arms are connected to each other at the end opposite to the tip by the rotation shaft. It is characterized by that.

  Moreover, invention of Claim 12 is the instrument for refractive index measurement of Claim 1, Comprising: The said 1st measurement member is a transparent and flat plate-like 1st flat plate member, and said 1st A first frame that sandwiches the edge of the first contact member and the edge of the first plate member so that the flat plate member is in close contact with the opposite surface of the contact surface of the first contact member; Further, the second measuring member includes a second flat plate member having a transparent and flat plate shape, and the second flat plate member so that the second flat plate member is brought into close contact with an opposing surface of the close contact surface of the second close contact member. And a second frame that sandwiches an edge of the close contact member and an edge of the second flat plate member, and the first measurement member holding portion holds the first frame. 1 holding | maintenance part, The said 2nd measurement member holding | maintenance part is equipped with the 2nd holding | maintenance part holding the said 2nd frame, It is characterized by the above-mentioned.

  The invention according to claim 13 is the refractive index measuring instrument according to claim 1, wherein the first measurement member is in close contact with the facing surface of the close contact surface of the first close contact member. A transparent and flat plate-like first flat plate member is further included, and the second measurement member further includes a transparent and flat plate-like second flat plate member that is in close contact with the facing surface of the close contact surface of the second close contact member. The first measurement member holding portion includes a first holding portion for holding the first flat plate member, and the second measurement member holding portion is a second for holding the second flat plate member. The holding part is provided.

  The invention according to claim 14 is the refractive index measurement instrument according to claim 1, wherein the moving mechanism part includes two arms, and the first measurement member holding part is One of the two arms is provided at the tip of one arm so as to be movable with respect to the one arm, and the second measuring member holding portion is at the tip of the other arm with respect to the other arm. It is characterized by being movably provided.

  A refractive index measuring instrument according to the present invention includes a first measurement member including a first contact member that is transparent, flexible, and has a known refractive index that is in close contact with one surface of a test lens, and a test lens. In order to measure the refractive index of the lens material forming the test lens, using a second measurement member including a second adhesion member having a known refractive index that is transparent, flexible, and closely adhered to the other surface It is what is used. In this refractive index measuring instrument, the close contact surface of the first close contact member that is in close contact with one surface of the lens to be tested is opposed to the close contact surface of the second close contact member that is in close contact with the other surface. And a first measurement member holding part for holding the first measurement member and a second measurement member holding part for holding the second measurement member, and a close contact surface of the first close contact member and a second close contact member A moving mechanism for relatively moving the first measurement member holding portion and the second measurement member holding portion is provided so as to change the distance from the close contact surface. Then, the refractive index of the lens material is measured in a state where the test lens is sandwiched between the first contact member and the second contact member.

  According to the refractive index measuring instrument having such a configuration, once the first and second measuring members are once mounted on the refractive index measuring instrument, the first and second measuring members are directly held by fingers. Since the measurement operation can be performed without doing so, it is possible to prevent dirt such as fingerprints from adhering to the first and second measurement members. Further, it is possible to prevent a decrease in measurement accuracy due to adhesion of dirt.

  In addition, since the work for peeling off the release paper and the work for attaching can be performed in a state where the first and second measuring members are mounted on the refractive index measuring instrument, the first and second measuring members in these work can be performed. Can be easily handled. In addition, it is possible to prevent dirt such as fingerprints from adhering to the first and second measurement members during these operations.

  Further, when placing the test lens with the first and second measurement members mounted on the lens meter or when removing the lens from the lens meter, the test lens itself is not held with a finger as in the prior art. Since the work can be performed while holding the refractive index measuring instrument, these work can be easily performed with good operability.

  An example of an embodiment of a refractive index measuring instrument according to the present invention will be described in detail with reference to the drawings.

<First Embodiment>
[overall structure]
FIG. 1 shows an example of the overall configuration of a refractive index measuring instrument according to the present invention. The refractive index measuring instrument 1 shown in FIG. 1 has a shape like a bag and includes arms 2 and 3, a rotating shaft 4 and a spring 5. Reference symbol L indicates a lens to be used for measurement of the refractive index of the lens material.

  An opening (not shown) is formed in the middle of each arm 2 and 3. The rotating shaft 4 is inserted through the openings of the arms 2 and 3. The arms 2 and 3 are connected so as to cross each other on the rotation shaft 4 and are rotatable about the rotation shaft 4.

  At the ends of the arms 2 and 3, annular operation portions 2 </ b> A and 3 </ b> A for a user to insert a finger are provided, respectively. The operation units 2A, 3A and the rotation shaft 4 correspond to an example of the “movement mechanism unit” in the present invention.

  Further, measurement member holding portions 2B and 3B are provided at the tips of the arms 2 and 3, respectively. The measurement member holding portions 2B and 3B are equipped with measurement members described later. The measurement member holding portions 2B and 3B are provided so as to be rotatable about rotation shafts 2a and 3a attached to the tips of the arms 2 and 3, respectively.

  The shapes of the arms 2 and 3 between the measurement member holding portions 2B and 3B and the rotation shaft 4 are in contact with the lens L in consideration of the thickness (edge thickness) of the edge of the lens L. The shape is curved so that it does not. That is, the arm 2 (3) is curved in a direction away from the arm 3 (2) from the tip provided with the measurement member holding portion 2B (3B) toward the rotation shaft 4, and then the arm 3 ( It has a shape curved in the direction approaching 2) and is connected to the arm 3 (2) by the pivot shaft 4.

  When the user increases the interval between the operation units 2A and 3A, the arms 2 and 3 rotate about the rotation shaft 4, respectively, and the interval between the measurement member holding units 2B and 3B decreases. Conversely, if the interval between the operation units 2A and 3A is reduced, the interval between the measurement member holding units 2B and 3B is reduced.

  One end of the spring 5 is connected to the arm 2 at a position closer to the operation portion 2A than the rotation shaft 4, and the other end of the spring 5 is connected to the arm 3 at a position closer to the operation portion 3A than the rotation shaft 4. It is connected. The spring 5 is connected to the arms 2 and 3 in a state where the spring 5 is extended beyond the natural length, and urges the arms 2 and 3 to elastic force in a direction in which the operation units 2A and 3A are brought close to each other. Therefore, the spring 5 acts to urge the elastic force in a direction in which the measurement member holding portions 2B and 3B are brought close to each other (that is, in a direction to narrow the interval between the measurement member holding portions 2B and 3B). The spring 5 is an example of a biasing unit that biases such an elastic force.

[Measuring member holder]
An example of the configuration of the measurement member holding portions 2B and 3B will be described with reference to FIG. FIG. 2 is a top view of the tip of the arm 2 (3) of the refractive index measuring instrument 1 shown in FIG. 1 and the measurement member holding portions 2B and 3B. The measurement member holding portions 2B and 3B correspond to examples of the “first measurement member holding portion” and the “second measurement member holding portion” in the present invention.

  The tip of the arm 2 (3) is divided into two forks to form two support arms 20A (30A). The two support arms 20A (30A) support the measurement member holding portion 2B (3B), and are formed in a substantially C shape. An opening (not shown) is formed in the vicinity of the tip of each support arm 20A (30A), and the rotation shaft 2a (3a) is inserted through this opening.

  The measurement member holding part 2B (3B) includes a first holding frame 21 (31), a second holding frame 22 (32), and a rotating shaft 23 (33).

  The first holding frame 21 (31) is for holding the second holding frame 22 (32). The first holding frame 21 (31) is formed in a substantially C shape and is disposed inside the support arm 20A (30A). An opening (not shown) is formed in the first holding frame 21 (31), and the rotation shaft 2a (3a) is fitted into this opening. The support arm 20A (30A) and the first holding frame 21 (31) are connected by the rotating shaft 2a (3a). The first holding frame 21 (31) is rotatably connected to the support arm 20A (30A) about the rotation shaft 2a (3a) (that is, about the axis A1). For example, a mechanism such as a bearing can be used as the rotating mechanism.

  The first holding frame 21 (31) has an opening (not shown) at a position on the axis A2 orthogonal to the axis A1. The rotation shaft 23 (33) is inserted through this opening.

  The second holding frame 22 (32) corresponds to an example of the “first holding portion” and the “second holding portion” in the present invention, and is for holding the measuring member 100. The second holding frame 22 (32) is formed in a substantially C shape and is disposed inside the first holding frame 21 (31). The second holding frame 22 (32) has an opening (not shown) at a position on the axis A2, and the rotation shaft 23 (33) is fitted into the opening. The first holding frame 21 (31) and the second holding frame 22 (32) are connected by the rotating shaft 22 (32). The second holding frame 22 (32) is connected to the first holding frame 21 (31) so as to be rotatable about the rotation shaft 23 (33) (that is, about the axis A2). For example, a mechanism such as a bearing can be used as the rotating mechanism.

  According to such measurement member holding portions 2B and 3B, the measurement member 100 can be held so as to freely rotate about the axes A1 and A2 orthogonal to each other.

  FIG. 3 shows an example of a holding mode of the measuring member 100 by the second holding unit 22 (32). The second holding portion 22 (32) is formed in a substantially C shape as described above. An engagement groove 22a (32a) is formed in the inner peripheral portion of the second holding portion 22 (32). The measuring member 100 is attached to the second holding portion 22 (32) so that the edge (the coupling frame 130; see FIGS. 4 and 5) is engaged with the engaging groove 22a (32a). That is, the second holding portion 22 (32) has a shape in which one side of the rectangle is cut out, and the edge (a coupling frame 130 described later) of the measuring member 100 is engaged with the engagement groove 22a (32a) at the cutout position. ). Thereby, the measuring member 100 is held by the second holding portion 22 (32) in a state where the edge thereof is engaged with the engaging groove 22a (32a).

[Measuring member]
An example of the configuration of the measurement member 100 will be described with reference to FIGS. 4 and 5. As shown in FIG. 4, the measuring member 100 is in close contact with both the front surface La and the back surface Lb of the lens L to be measured. Although illustration is omitted, the measurement member 100 on the front surface La side is held by the measurement member holding portion 2B shown in FIG. 1, and the measurement member 100 on the back surface Lb side is held by the measurement member holding portion 3B. Yes.

  The measurement member 100 corresponds to an example of the “first measurement member” and the “second measurement member” of the present invention. Like the gel body described in Patent Document 1, the measurement member L is attached to the measurement member 100. It is a member used for measuring the refractive index of the lens material to be formed. The measuring member 100 includes a gel body 110, a flat plate 120, and a coupling frame 130.

  The gel body 110 corresponds to an example of the “first contact member” and the “second contact member” of the present invention, and is made of a transparent and flexible material such as silicon gel. A fringe portion 110 a is formed at the edge of the gel body 110. The material constituting the gel body 110 has a known refractive index n.

  The flat plate 120 corresponds to an example of the “first flat plate member” and the “second flat plate member” of the present invention, and is made of a transparent material such as glass or plastic. The flat plate 120 is formed such that a surface that is in close contact with the gel body 110 and a surface that faces the surface are parallel to each other.

  The coupling frame 130 corresponds to an example of the “first frame” and the “second frame” of the present invention, and is a frame for coupling the gel body 110 and the flat plate 120. More specifically, the coupling frame 130 couples the gel body 110 and the flat plate 120 by sandwiching the fringe portion 110 a of the gel body 110 and the edge of the flat plate 120. The coupling frame 130 is made of a material such as plastic.

  The measurement member 100 that is in close contact with the front surface La of the lens L and the measurement member 100 that is in close contact with the back surface Lb may be the same or different. In the case of using different measuring members 100 on the front surface La side and the back surface Lb side, for example, the surface of the gel body 110 (contact surface) that is in close contact with the lens surface is shaped according to the curvature of the front surface La and the back surface Lb. Each can be formed. Further, since the curvatures of the front surface La and the back surface Lb vary depending on the type of the test lens L, various measurement members 100 that are in close contact with the front surface La and the back surface Lb are used so as to correspond to various test lenses L. You may make it prepare.

[About lens meter]
The refractive index of the lens material of the test lens L is measured using a lens meter. 6 to 8 show an example of the configuration of a lens meter used for measuring the refractive index of a lens material. The lens meter 1000 shown in the figure can be used as a normal lens meter for measuring optical characteristics such as the spherical power, astigmatism power, astigmatism axis angle, prism power, prism base direction, etc. It can also be used to measure the refractive index of the lens material used.

  FIG. 6 shows an example of the external configuration of the lens meter 1000. A display unit 1003 including an arbitrary display device such as a liquid crystal display (LCD) or a CRT (Cathode Ray Tube) display is provided on the upper front surface of the main body 1002 of the lens meter 1000. On the display screen 1003a of the display unit 1003, various screens such as a measurement result of the optical characteristic value (including the refractive index of the lens material) of the lens L and a mapping image representing the distribution of the measured optical characteristic value are displayed. Is done.

  Optical member storage units 1004 and 1005 that store various optical members for measuring the optical characteristic value of the lens L to be measured are arranged vertically below the display unit 1003.

  A lens receiver to which a lens receiver 1013 on which the lens L to be measured (the measurement member 100 is in close contact or in close contact) is placed is attached to the upper end of the optical member housing 1005. A table 1006 is provided.

  The lens receiver 1013 includes a flat transparent plate 1013a made of transparent glass, transparent resin, or the like, and a lens support portion 1013b that protrudes upward through the central portion of the transparent plate 1013a. The lower end of the lens support portion 1013b is connected to the Hartmann plate 1111 (see FIGS. 7 and 8). The test lens L is used for measurement while being supported by the lens support 1013b. The lens support portion 13b acts to keep the distance between the lens L to be examined and the Hartmann plate 1111 constant.

  A lens pad 1007 is provided on the front surface of the main body 1002 behind the lens support portion 1013b so as to be movable in the front-rear direction. The lens pad 1007 is moved back and forth by rotating the operation lever 1008.

  A slider 1009a supported so as to be movable in the horizontal direction is provided on the upper edge of the lens pad 1007. A nose pad support member 1009 is connected to the tip of the slider 1009a so as to be rotatable up and down.

  Examples of the lens L to be used for measurement by the lens meter 1000 include a circular unprocessed lens, a lens ground for spectacles, a lens framed in a spectacle frame, and the like. When measuring the optical characteristic value of the lens framed in the spectacle frame, the nose pad of the spectacle frame is placed in engagement with the nose pad support member 1009. In this state, the spectacle frame and the nose pad support member 1009 are moved to the left and right together with the slider 1009a to adjust the position in the left-right direction, and are moved downward, so that the test lens L framed in the spectacle frame is moved to the lens. It arrange | positions on the support part 1013a and measures an optical characteristic value.

  On the front surface of the main body 1002 of the lens meter 1000, buttons and switches for various operations such as a mode switching button 1010 for switching the measurement mode and a measurement button 1011 for starting and stopping the measurement are provided. ing.

  7 and 8 show the configuration of an optical characteristic value measurement optical system included in the lens meter 1000. FIG. As described above, the lens L (and the measurement member 100) is disposed at the upper end position of the lens support portion 1013b. The optical system of the lens meter 1000 has the same configuration as the conventional one, and is stored in the optical member storage portions 1004 and 1005 of the main body 1002.

  The optical system of the lens meter 1000 includes an illumination optical system 1100 housed in the upper optical member housing portion 1004 and a light receiving optical system 1110 housed in the optical member housing portion 1005.

  The illumination optical system 1100 is an optical system that projects measurement light onto the lens L to be measured, and includes an LED (Light Emitting Diode) 1101 as a light source that emits measurement light, and measurement light from the LED 1101. And a collimator lens 1102 that projects on the lens L to be measured supported by the lens support portion 1013b. The measurement light emitted from the LED 1101 is, for example, red light.

  The light receiving optical system 1110 includes a Hartmann plate 1111, a screen 1112, a field lens (field lens) 1113, an imaging lens 1114, and a CCD (Charge Coupled Device) 1115. The screen 1112 and the CCD 1115 are disposed at optically conjugate positions.

  As shown in FIG. 8A, the Hartmann plate 1111 is formed with a large number of circular openings 1111a arranged at equal intervals in the vertical and horizontal directions (two-dimensionally). These openings 1111a are arranged vertically and horizontally, for example, at intervals of 2 millimeters. The measurement light transmitted through the lens L supported by the lens support portion 1013b is converted into a large number of measurement light by passing through the opening 1111a of the Hartmann plate 1111. The lower end portion of the lens support portion 1013b is joined to the Hartmann plate 1111.

  In addition, it can replace with the Hartmann plate 1111 of FIG. 8 (A), and can also measure using a 4 hole type plate (4 hole plate) 1111 'as shown in FIG. 8 (B). In this four-hole plate 1111 ′, openings 1111a ′ are formed at positions corresponding to the four apexes of the quadrangle.

  On the screen 1112, a large number of measurement lights generated through the opening 1111 a of the Hartmann plate 1111 are projected. The projection position on the screen 1112 and the shape of the projection image change according to the optical characteristic value of the lens L to be measured for each of a large number of measurement lights. As a result, the projection pattern of the large number of measurement lights on the screen 1112 is reduced / enlarged or distorted.

  A large number of measurement lights projected on the screen 1112 pass through the screen 1112, and pass through the field lens 1113 and the imaging lens 1114. The light receiving surface of the CCD 1115 provided at a position optically conjugate with the screen 1112. Imaged on top.

  The CCD 1115 receives the large number of measurement lights, converts them into electrical signals (that is, photoelectrically converts them), and outputs them. The image signal output from the CCD 1115 includes information indicating the light receiving position and the shape of the received light image for each of the many measurement lights received. This information is expressed as the position (coordinates) of each pixel of the CCD 1115.

  The lens meter 1000 includes calculation means (a microprocessor such as a CPU that operates according to a predetermined calculation program) that analyzes the image signal output from the CCD 1115 and calculates the optical characteristic value of the lens L to be tested (illustration is shown). (Omitted). The calculated optical characteristic value and its mapping image are displayed on the display screen 1003a by the microprocessor.

[Refractive index measurement procedure]
An example of a procedure for measuring the refractive index of the lens material using the refractive index measuring instrument 1 according to this embodiment will be described.

  First, the user places the test lens L on the upper end of the lens support portion 1013b of the lens meter 1000, and measures the refractive power of the test lens L in the strong principal meridian direction. The refractive power of the test lens L is obtained by calculating the sum S + C = D of the measurement results of the spherical power S and the astigmatism power C in the strong principal meridian direction of the test lens L. This processing is executed by the microprocessor of the lens meter 1000. The measured value D of the refractive power of the test lens L is stored in the memory of the lens meter 1000, for example.

  Next, the user takes out the pair of measurement members 100 from the case (not shown). A release paper for protecting the contact surface from dirt and damage is attached to the contact surface of the gel body 110 of each measurement member 100 (the surface to be contacted to the lens L to be tested; described above).

  The user extends the interval between the measurement member holding portions 2B and 3B by operating the operation portions 2A and 3A through a finger so as to increase the interval between the operation portions 2A and 3A, and in the manner shown in FIG. The measuring member 100 is attached to each of 2B and 3B. Then, the release paper is peeled off from the gel body 110 of each measurement member 100.

  Here, after removing the release paper from the gel body 110, the measurement member 100 may be attached to the measurement member holding portions 2B and 3B. However, the attachment work may be contaminated during the attachment operation. It is better to peel the release paper later.

  Further, when the release paper is peeled off before being attached to the measurement member holding portions 2B and 3B, the user holds the coupling frame 130 with a finger to peel off the release paper so as not to attach dirt to the flat plate 120. Since the measurement member 100 is small in size, the measurement member 100 may not be securely held and the measurement member 100 may be dropped, or the release paper may not be easily peeled off. On the other hand, if the release paper is peeled off after being attached to the measurement member holding portions 2B and 3B, the operation portions 2A and 3A can be firmly held with fingers, so that the possibility of dropping the measurement member 100 can be reduced. The operation of peeling the release paper can be easily performed.

  Now, when the release paper is peeled off from the gel body 110, the lens L to be measured is arranged between the measurement member 100 on the measurement member holding part 2B side and the measurement member 100 on the measurement member holding part 3B side. Then, the operation portions 2A and 3A are operated to narrow the interval between the measurement member holding portions 2B and 3B, and the adhesion surface of the gel body 110 of the measurement member 100 on the measurement member holding portion 2B side is set to the surface La of the test lens L. While making it closely_contact | adhere, the contact | adherence surface of the gel body 110 of the measurement member 100 of the measurement member holding | maintenance part 3B side is closely_contact | adhered to the back surface Lb of the lens L to be examined.

  At this time, the spring 5 acts to urge the force in the direction in which the contact surfaces of the gel bodies 110 on both sides are pressed against the lens surface of the lens L to be examined. Thereby, bubbles between the adhesion surface of the gel body 110 and the lens surface are removed, and the gel body 110 is suitably adhered to the lens surface. Further, when bubbles are present between the gel body 110 and the flat plate 120, these bubbles are also removed. It is also possible to enhance the action of removing bubbles by operating the operation units 2A and 3B to urge the gel bodies 110 on both sides against the lens L to be pressed.

  Further, the urging force of the spring 5 also acts to maintain a close contact state between the gel body 110 and the lens surface that have been preferably brought into close contact with each other. Thereby, even if the user does not continue to apply force in the direction of narrowing the interval between the measurement member holding portions 2B and 3B by the operation portions 2A and 3A, the close contact state between the gel body 110 and the lens surface is deteriorated (bubbles are contained. Etc.) The situation can be prevented. Furthermore, the situation where the position of the measuring member 100 with respect to the test lens L is displaced or the test lens L falls is also prevented.

  The user places the test lens L held by the measurement member holding portions 2B and 3B on the upper end of the lens support portion 1013b of the lens meter 1000. Then, the combined refractive power of the test lens L in the strong principal meridian direction of the test lens L and the measurement member 100 in close contact with both lens surfaces is measured. The measured value D ′ of the combined refractive power is stored in the memory of the lens meter 1000, for example.

  The microprocessor of the lens meter 1000 includes a measured value D of the refractive power of the test lens L, a measurement result D ′ of the combined refractive power of the test lens L and the two measuring members 100, and a refractive index n of the gel body 110. Is substituted into the following equation to calculate the refractive index N of the lens material of the lens L to be tested.

  The microprocessor stores the calculation result N of the refractive index of the lens material in the memory and displays it on the display screen 1003a. The measurement of the refractive index of the lens material using the refractive index measuring instrument 1 is thus completed.

  After the measurement work is completed, the user removes the lens L to be measured held by the refractive index measuring instrument 1 from the lens meter 1000 and operates the operation units 2A and 3A to set the interval between the measurement member holding units 2B and 3B. Unfold and remove the lens L. Further, the user affixes release paper to the close contact surface of the gel body 110 of the measurement member 100 held by the measurement member holding portions 2B and 3B. And the measuring member 100 is removed from each measuring member holding | maintenance part 2B, 3B in the reverse way of FIG. 3, and it accommodates in a case.

  Here, as in the case of peeling off the release paper, the release paper may be attached after the measurement member 100 is removed, but the release paper is attached to the measurement member 100 mounted in the measurement member holding portions 2B and 3B. By sticking, it is possible to prevent the measurement member 100 from dropping and to facilitate the work of attaching the release paper.

[Action / Effect]
The operation and effect of the refractive index measuring instrument 1 according to this embodiment having the configuration as described above will be described.

  The instrument 1 for refractive index measurement uses a measurement member 100 that includes a gel body 110 having a known refractive index n that is transparent, flexible, and in close contact with the front surface La and the back surface Lb of the test lens L. This is used for measuring the refractive index of the lens material of L. Furthermore, in this refractive index measuring instrument 1, the close contact surface of the gel body 110 that is in close contact with the surface La of the lens L to be tested and the close contact surface of the gel body 110 that is in close contact with the back surface Lb are opposed to each other. The arm 2 for relatively moving the measurement member holding portions 2B and 3B so as to change the distance between the contact surfaces of the measurement member holding portions 2B and 3B holding both measurement members 100 and the gel body 110. 3 and the rotating shaft 4. Then, the lens meter 1000 is used to measure the refractive index in a state where the lens L is held by the gel body 110 of the measurement member 100 held by each of the measurement member holding portions 2B and 3B.

  According to the refractive index measuring instrument 1 having such a configuration, after the measuring member 100 is mounted on the refractive index measuring instrument 1, it is not necessary to directly hold the measuring member 100 with a finger. Can be prevented from adhering to the measuring member 100. Further, it is possible to prevent a decrease in measurement accuracy due to adhesion of dirt.

  In addition, since the work for peeling off the release paper and the work for pasting can be performed in a state where the measurement member 100 is mounted on the refractive index measurement instrument 1, the measurement member 100 can be easily handled in these operations. It is possible to prevent dirt such as fingerprints from adhering to the measurement member 100 during the operation.

  Further, when the test lens L to which the measurement member 100 is attached is placed on the lens meter 1000 or removed from the lens meter 1000, the test lens L itself is not held with a finger as in the prior art. Since operations can be performed while holding the refractive index measuring instrument 1 (the operation units 2A and 3A), it is possible to facilitate these operations.

  The refractive index measuring instrument 1 according to the present embodiment includes two arms 2 and 3 that are connected to each other by a rotation shaft 4 and have operation units 2A and 3A, respectively. They are provided at the tips of the arms 2 and 3, respectively. Then, when the user operates the operation units 2A and 3A, the two arms 2 and 3 rotate relative to each other about the rotation shaft 4, thereby being held by the measurement member holding units 2B and 3B, respectively. The interval between the contact surfaces of the measuring member 100 is changed. Thus, since the refractive index measuring instrument 1 has a shape like a bag, the operability is good.

  In addition, since the refractive index measuring instrument 1 is provided with a spring 5 for urging the two arms 2 and 3 in the direction of narrowing the distance between the measuring member holding portions 2B and 3B, The situation where the test lens L and the gel body 110 are peeled off can be prevented, and the measurement can be facilitated. Further, it is possible to remove bubbles between the gel body 110 and the flat plate 120 or between the gel body 110 and the lens L to be tested, and to prevent new bubbles from being formed. it can.

  Each of the two arms 2 and 3 is curved in a direction away from the other arm from the tip where the measurement member holding portions 2B and 3B are provided toward the rotation shaft 4, and then the other arm It has a shape that is curved in the direction approaching the arm, so that the situation where the edge of the lens L to be in contact with the arms 2 and 3 is avoided. As a result, the measurement lens 100 mounted on the measurement member holding portions 2B and 3B can be securely sandwiched and the measurement can be performed. Further, it is possible to remove bubbles between the gel body 110 and the flat plate 120 or between the gel body 110 and the lens L to be tested, and to prevent new bubbles from being formed. it can.

  The measurement member holding portions 2B and 3B have first holding frames 21 and 31 that are supported by the arms 2 and 3 so as to be rotatable about the axis A1 (rotating shaft 2a), and the first holding frames. Second holding portions 22 and 32 supported rotatably about an axis A2 (rotating shafts 23 and 33) orthogonal to the axis A1 with respect to the frames 21 and 31. The measurement member 100 is held by the second holding portions 22 and 32. Accordingly, the measurement member holding portions 2B and 3B are movable with respect to the arms 2 and 3, respectively, and the direction of the close contact surface of the gel body 110 of the measurement member 100 can be freely changed. Therefore, regardless of the shape of the lens surface of the test lens L, the test lens L can be reliably sandwiched between the two measurement members 100. Further, it is possible to remove bubbles between the gel body 110 and the flat plate 120 or between the gel body 110 and the lens L to be tested, and to prevent new bubbles from being formed. it can.

  Since the measuring member 100 according to the present embodiment has a configuration in which the gel body 110 and the planar plate 120 are coupled by the coupling frame 130, the gel body 110 and the planar plate 120 can be prevented from being separated from each other and measured. Work can be performed smoothly. Further, since the gel body 110 and the flat plate 120 are brought into close contact with each other by the coupling frame 130, it is possible to remove bubbles between the gel body 110 and the flat plate 120, and new bubbles are formed. This can be prevented.

  Further, by using the coupling frame 130 that detachably couples the gel body 110 and the flat plate 120, the gel body 110 and the flat plate 120 can be easily and effectively cleaned. As such a coupling frame 130, for example, a coupling frame 130 made of a material such as an elastic member such as elastic rubber can be applied. Moreover, it is also possible to apply the coupling frame 130 having a configuration that can be separated into a plurality (for example, two).

[Modification]
The configuration described above is merely a specific example for suitably implementing the refractive index measuring instrument according to the present invention. Therefore, arbitrary modifications within the scope of the present invention can be appropriately made. Hereinafter, other embodiments of the instrument for measuring a refractive index according to the present invention will be described.

[Modifications related to the arm]
9 and 10 show an example of the form of the arm in the refractive index measuring instrument according to the present invention. In these drawings, the measurement member holding portion is omitted.

  The refractive index measuring instrument 40 shown in FIG. 9 has two arms 41 and 42, a rotating shaft 43 and a spring 44. The arm 41 is provided with an operation unit 41A, and the arm 42 is provided with an operation unit 42A.

  The rotating shaft 43 connects one end of each arm 41, 42. The arms 41 and 42 are connected so as to be rotatable about a rotation shaft 43. Further, a measuring member holding portion (not shown) is provided at the other end (tip) of each arm 41, 42, respectively.

  The spring 44 is connected to the arms 41 and 42 in a state where the spring 44 is extended more than the natural length, and in the direction in which the tips of the arms 41 and 42 (the measurement member holding portions) approach each other (that is, the interval between the measurement member holding portions is increased). It acts to urge the elastic force (in the direction of narrowing).

  The user puts the measurement member 100 and the lens L to be tested by operating the operation parts 41A and 42A so that the tips of the arms 41 and 42 are separated from each other.

  According to the refractive index measuring instrument 40, the same operation and effect as the refractive index measuring instrument 1 of the above embodiment can be obtained.

  The refractive index measuring instrument 50 shown in FIG. 10 has two arms 51 and 52, a rotating shaft 53 and a spring 54. The arm 51 is provided with an operation unit 51A, and the arm 52 is provided with an operation unit 52A. The operation portions 51 and 52 of the refractive index measuring instrument 50 do not need to be annularly formed like the refractive index measuring instrument 1 of the above embodiment or the refractive index measuring instrument 40 of FIG. 9 (the reason will be described later). ).

  The arms 51 and 52 do not cross at the position of the rotation shaft 53. That is, both ends of the arm 51 are positioned in the same direction with respect to the rotation shaft 53. Similarly, both ends of the arm 52 are positioned in the same direction with respect to the rotation shaft 53 (a direction opposite to both ends of the arm 51 with respect to the rotation shaft 53).

  The rotation shaft 53 connects the arms 51 and 52 at the middle position of the arms 51 and 52. The arms 51 and 52 are connected so as to be rotatable about a rotation shaft 53. Further, measurement member holding portions (not shown) are provided at the tips of the arms 51 and 52, respectively.

  The spring 54 is connected to the arms 51 and 52 in a state where the spring 54 is compressed more than the natural length, and urges the elastic force in a direction in which the operation units 51A and 52A are separated from each other. Therefore, the spring 54 acts to urge the elastic force in a direction in which the tips (the measurement member holding portions) of the arms 51 and 52 are close to each other (that is, in a direction to narrow the interval between the measurement member holding portions). Yes.

  When the user reduces the distance between the operation portions 51A and 52A against the elastic force of the spring 54, the tips of the arms 51 and 52 are separated from each other. In this state, the measurement member 100 and the test lens L are attached.

  According to the refractive index measuring instrument 50, the same operation and effect as the refractive index measuring instrument 1 of the above embodiment can be obtained. According to the refractive index measuring instrument 50, since the biasing force of the spring 54 acts to separate the operation parts 51A and 52A, there is no need to perform an operation of separating the operation parts 51A and 52A. There is no need to form the operation portions 51A and 52A in an annular shape.

[Modifications related to measuring members]
FIG. 11 shows an example of another form of the measuring member according to the present invention. FIG. 11A shows a flat plate 220 that constitutes a measurement member, and FIG. 11B shows a gel body 210.

  The gel body 210 is formed in a columnar shape. On the side surface of the gel body 210, substantially L-shaped fitting members 210a and 210b are provided. Each of the fitting members 210a and 210b includes a portion (first portion) extending in a direction along the central axis of the columnar gel body 210 and a portion (second portion) extending in a direction substantially orthogonal to the first portion. ).

  Each of the fitting members 210 a and 210 b has a part of the first portion connected to the side surface of the gel body 210. Each first portion is formed so as to protrude to the surface facing the close contact surface of the gel body 210 (the surface that is in close contact with the lens L to be tested; described above). In addition, the second portion of each of the fitting members 210a and 210b is provided from the protruding portion of the first portion toward the opposite direction of the central axis of the gel body 210 (the radial direction of the columnar gel body 210). Yes.

  Two holes 220 a and 220 b are formed on one surface of the flat plate 220. The holes 220a and 220b are formed at positions where the two fitting members 210a and 210b of the gel body 210 can be inserted simultaneously.

  The user rotates the gel body 210 and the flat plate 220 relatively in a predetermined direction in a state where the insertion members 210a and 210b of the gel body 210 are inserted into the holes 220a and 220b of the flat plate 220. The gel body 210 and the flat plate 220 are integrated by engaging 210b with the holes 220a and 220b.

  Further, the integrated gel body 210 and the flat plate 220 are rotated relative to each other in the direction opposite to the predetermined direction to release the engagement state between the fitting members 210a and 210b and the holes 220a and 220b. Thus, the gel body 210 and the flat plate 220 can be separated. Here, in the structure shown in FIG. 11, these can be integrated by rotating the gel body 210 clockwise with respect to the plane plate 220, and these can be isolate | separated by rotating counterclockwise.

  By detachably coupling the gel body 210 and the flat plate 220 in this manner, it is possible to easily and effectively perform the cleaning operation of the gel body 210 and the flat plate 220 as in the above embodiment. .

  As another configuration of the measurement member, the gel body and the flat plate can be bonded using an adhesive. It is desirable that the adhesive used at this time is transparent. Moreover, it is desirable to use an adhesive that does not contain (is difficult to contain) bubbles. Moreover, the adhesive agent which joins a gel body and a plane plate so that attachment or detachment is possible can also be used.

  Further, since the gel body has a certain degree of adhesiveness, it is possible to adopt a configuration in which the gel body and the flat plate are joined by the adhesive force.

  In addition, when applying the structure which couple | bonds a gel body and a plane plate without using the 1st, 2nd frame of this invention like the coupling frame 130, each measuring member holding | maintenance part hold | maintains a plane plate. Is configured to hold the measurement member. For example, in the above-described embodiment, the flat plate 120 is provided in the engaging grooves 22a and 32a of the second holding frames 22 and 32 (first holding portion and second holding portion) of the measurement member holding portions 2B and 3B. Will be engaged.

[Modifications for measuring member holding part]
FIG. 12 illustrates an example of another form of the measurement member holding unit. The measurement member holding portion shown in the figure has a spherical joint 61 b provided at the tip of a projecting shaft 61 a formed at the tip of the arm 61. The first holding frame 62 has a spherical recess that is slidably fitted to the joint 61b. Accordingly, the first holding frame 62 is connected to the arm 61 so as to be rotatable about the protruding shaft 61a (axis B2).

  The first holding frame 62 is formed in a substantially C shape. Openings (not shown) are formed at both ends of the first holding frame 62, and the rotation shaft 63 is inserted through these openings. A second holding frame 64 that holds the measuring member 100 is disposed inside the first holding frame 62. Holes (not shown) are formed in the second holding frame 64 at positions corresponding to the openings of the first holding frame 62, and a rotation shaft 63 is fitted into each hole. Yes. Thereby, the second holding frame 64 is rotatable with respect to the first holding frame 62 about the rotation shaft 63 (axis B1). Here, the axis B1 and the axis B2 are orthogonal to each other.

  According to such a measurement member holding portion, the test lens L can be reliably sandwiched between the two measurement members 100 regardless of the shape of the lens surface of the test lens L. Furthermore, it is possible to remove air bubbles between the gel body 110 and the flat plate 120 of the measuring member 100, or between the gel body 110 and the lens L, and that new air bubbles are formed. Can be prevented.

[Other variations]
In the above-described embodiment, a fixing means for fixing the interval between the measurement member holding portions 2B and 3B can be provided. As this fixing means, any configuration that prohibits the rotation of the arms 2 and 3 around the rotation shaft 4 can be applied. For example, any member (hook, belt, etc.) that prohibits rotation by hanging over the arms 2 and 3, or a lock having an arbitrary configuration that locks the rotation operation of the arms 2 and 3 around the rotation shaft 4. A mechanism or the like can be used.

  As a result, the state in which the test lens L is sandwiched between the two measurement members 100 can be easily and reliably maintained, the measurement operation can be facilitated, and the test lens L can be prevented from falling or being displaced. can do.

  Further, by configuring the fixing means so that the interval between the measurement member holding portions 2B and 3B is slightly narrowed when the fixing means is operated, it is possible to improve the holding state of the lens L, and further, the gel It is possible to remove bubbles between the body 110 and the flat plate 120, or between the gel body 110 and the lens L to be tested, and to prevent new bubbles from being formed.

  For the case where the measurement member 100 is stored, for example, the following devices can be devised. In the above-described embodiment, the measurement member 100 is taken out of the case using a finger or stored in the case. At that time, there is a possibility that a fingerprint or the like may adhere to the measurement member 100. In order to deal with this problem, for example, by using a case having a member such as a shelf for holding the measurement member 100 at the left edge of the measurement member 100 shown in FIG. When the measurement member 100 is attached to 3B or when the measurement member 100 is detached from the measurement member holding portions 2B and 3B, the operation can be performed without directly touching the measurement member 100.

  The instrument for measuring refractive index according to the present invention may or may not include a measurement member.

  The modification described above can be applied as appropriate to the following second embodiment.

<Second Embodiment>
A second embodiment of the refractive index measuring instrument according to the present invention will be described with reference to FIGS. The refractive index measuring instrument 300 according to this embodiment makes it possible to change the distance between the two measuring members 500 in a state where the close contact surfaces are maintained substantially parallel to each other.

  FIG. 13 is a perspective view from the front end side of the refractive index measuring instrument 300. FIG. 14 is a diagram for explaining how the measurement member is attached to the refractive index measurement instrument 300. 15 and 16 are perspective views from the distal end side of the refractive index measuring instrument 300. FIG.

  In addition, in FIG. 14, the part regarding mounting | wearing of a measurement member is drawn especially. In FIGS. 15 and 16, in order to explain the internal configuration of the refractive index measuring instrument 300, a part of its external configuration is omitted.

  In the following description, the side on which the measuring member 500 is attached to the refractive index measuring instrument 300 may be referred to as “tip (side)” and the opposite side may be referred to as “terminal (side)”. The direction connecting the tip and the end is referred to as “front-rear direction”, the facing direction of the two measuring members 500 is referred to as “up-down direction”, and the direction orthogonal to the front-rear direction and the up-down direction is “left-right direction, side” May be called.

[Constitution]
The refractive index measuring instrument 300 has two arms 310 and 330. These arms 310 and 330 are connected to each other by a rotation shaft 313 so as to be relatively rotatable. The arm 330 is an example of the “first arm” in the present invention. The arm 310 is an example of the “second arm” in the present invention. In addition, the refractive index measuring instrument 300 is configured symmetrically.

  The arm 310 includes an operation unit 311 and a movable unit 320 that are connected to each other.

  The operation unit 311 has a bent shape that protrudes toward the arm 330 at a position on the distal end side. Rotating shafts 313 projecting sideways are formed on both side surfaces of the projecting portion. The operation unit 311 is formed on a flat plate on the tip side of the protrusion.

  In addition, the operation unit 311 has a curved shape with a convex shape in the direction away from the arm 330 on the distal side of the protrusion. This curved shape takes account of ease of gripping when the user uses the refractive index measuring instrument 300. The operation unit 311 is an example of the “second operation unit” in the present invention.

  Measuring member holding portions 322 and 323 are provided at the tip of the movable portion 320. The measurement member holding portions 322 and 323 are disposed via a distance corresponding to the width of the measurement member 500.

  The measurement member 500 includes a gel body 510 and a transparent plate 520 as shown in FIG. One plane of the gel body 510 is in close contact with the transparent plate 520. The opposing surface of this plane is a contact surface that is in close contact with a test lens (not shown). The measurement member 500 of this embodiment is configured similarly to the measurement member shown in FIGS. 5 and 11, for example.

  Concavities and convexities are formed on the inner surfaces of the measurement member holding portions 322 and 323 to sandwich and fix the transparent plate 520 from above and below. The user attaches the measurement member 500 by inserting it into the measurement member holding portions 322 and 323 from the front end side. As a result, the measurement member 500 is fixed by the unevenness and is held by the measurement member holding portions 322 and 323. Further, the user can remove the measuring member 500 from the measuring member holding portions 322 and 323 by pulling it out in the reverse direction.

  In addition, on the upper surface of the movable portion 320, a push-down portion 324 is formed that includes a plurality of grooves extending in the left-right direction. The pressing unit 324 generates a frictional force with the finger when the user presses the movable unit 320 with the finger, for example, in order to bring the gel body 510 of the measuring member 500 into close contact with the test lens. As a result, the user can surely press down the movable portion 320 and ensure that the gel body 510 is in close contact with the lens to be examined. The pressing unit 324 may have any configuration as long as it has a function of generating a frictional force.

  As shown in FIG. 14, a fitting portion 325 extending downward is formed on the end side of the movable portion 320. As shown in FIG. 15, the fitting part 325 is formed in a hollow shape having an open end. At the lower end of the fitting part 325, a pair of opening parts 326 arranged in the left-right direction with a predetermined distance are provided. Each opening 326 forms a through hole that penetrates the lower surface of the fitting portion 325.

  Protruding portions 314 projecting sideways are formed on both side surfaces of the distal end of the operation portion 311. In addition, openings 321 are formed on both side surfaces at the end of the movable portion 320. The protrusion 314 is fitted into the opening 321. The opening 321 has a substantially elliptical shape extending in the front-rear direction. The protrusion 314 is movable in the front-rear direction within the opening 321. Thereby, the operation part 311 and the movable part 320 are connected so that it can move relatively.

  The arm 330 includes an operation unit 331 and a fixed unit 332 that are integrally formed. The operation unit 331 is located below the operation unit 311 of the arm 310. The fixed part 332 is located below the movable part 310 of the arm 310.

  The arm 330 bends in a direction away from the arm 310 from the tip (measurement member holding portions 333 and 334) toward the distal end, and then curves in a direction close to the arm 310 to form a fixing portion 332. is doing. The arm 330 forms an operation unit 331 and is connected to the arm 310 by a rotation shaft 313.

  The operation part 331 has substantially the same thickness (the thickness in the vertical direction) from the fixed part 332 side toward the end side, and the end protrudes downward. Thereby, the ease of grasping when grasping the operation units 311 and 331 is improved.

  An upper surface side of the operation unit 331 is opened. An opening 331 a is formed on a side surface of the operation unit 331 at a position corresponding to the rotation shaft 313. A rotation shaft 313 is rotatably fitted in the opening 331a. The rotating shaft 313 protrudes from the side surface of the operation unit 311 of the arm 310 as described above. As described above, the operation unit 311 (arm 310) and the operation unit 331 (arm 330) are coupled so as to be relatively rotatable about the rotation shaft 313.

  Measuring member holding portions 333 and 334 are provided at the tip of the fixing portion 332. The measurement member holding parts 333 and 334 are provided below the measurement member holding parts 322 and 323 of the movable part 320. The measurement member holding portions 333 and 334 are arranged via a distance corresponding to the width of the measurement member 500. Further, on the inner surfaces of the measurement member holding portions 333 and 334, irregularities for sandwiching and fixing the transparent plate 520 of the measurement member 500 from above and below are formed.

  Note that the measuring member 500 is attached to the movable portion 320 with the contact surface with respect to the lens to be examined facing downward. On the other hand, the measuring member 500 is attached to the fixing portion 332 with the close contact surface with the lens to be examined facing upward. That is, the measuring member 500 on the movable part 320 side and the measuring member 500 on the fixed part 332 side are mounted so that their close contact surfaces face each other.

  As shown in FIG. 13, a storage portion 332 a extending downward is formed on the operation portion 331 side of the fixed portion 332. The storage portion 332a has an internal region 332b that is open on the distal end side and the upper surface side. A fitting portion 325 of the arm 310 is inserted and fitted into the internal region 332b from above.

  In the internal region 332b, a pair of columnar members 335 extending upward from the bottom surface of the storage portion 332 are provided. The pair of columnar members 335 are provided side by side in the left-right direction through the same distance as the pair of openings 326. The left and right columnar members 335 are inserted through the left and right openings 326, respectively. Thereby, at least the upper end of each columnar member 335 is disposed in the hollow region of the fitting portion 325. Each columnar member 335 is constituted by, for example, a tapping screw, and is fixed to the bottom surface of the storage portion 332 by being screwed from above.

  On the outer periphery of each columnar member 335, a spring 340 is provided. The lower end of the spring 340 is in contact with the bottom surface of the hollow region of the fitting portion 325 (may be fixed to the bottom surface). A holding member 350 that holds the upper end of the spring 340 at the upper end position of the columnar member 335 is provided at the upper end of each columnar member 335. The holding member 350 is made of, for example, a washer provided on the screw head (upper end) side of the tapping screw. The diameter of this washer is designed to be larger than the diameter of the spring 340.

  The spring 340 applies an urging force downward to the bottom surface of the fitting portion 325 and applies an urging force upward to the holding member 350. That is, the spring 340 is attached to the columnar member 335 in a contracted state, and applies a biasing force in the direction of extending its length.

  Accordingly, when no force is applied to the operation units 311 and 331, the arms 310 and 330 maintain the state shown in FIG. That is, the spring 340 always applies a biasing force that acts to separate the end of the operation unit 311 of the arm 310 from the operation unit 331 of the arm 330. In other words, the spring 340 always applies a biasing force that acts to bring the contact surface of the measurement member 500 on the movable portion 320 side and the contact surface of the measurement member 500 on the fixed portion 332 side closer to each other.

[Operation]
The operation of the refractive index measuring instrument 300 having the above configuration will be described.

  The user holds the operation units 311 and 331. In a state in which no force is applied, as shown in FIG. 15, as described above, the spring 340 is arranged so that the end of the operation unit 311 is separated from the operation unit 331 (that is, the pair of upper and lower measurement members 500 are brought closer). The urging force is acting.

  The user operates the end of the operation unit 311 to be close to the operation unit 331 against this urging force. Then, the operation unit 311 rotates around the rotation shaft 313, and the distal end side of the operation unit 311 moves upward. At the same time, the movable part 320 moves upward. Thereby, as shown in FIG. 16, the space | interval of the contact surface of a pair of upper and lower measurement members 500 becomes large.

  As described above, in a state where the interval between the contact surfaces is widened, the user places the lens to be measured between the pair of upper and lower measurement members 500 and weakens the gripping force of the operation units 311 and 331 to reduce the contact between the upper and lower contact surfaces. Close the distance and close contact with the lens to be examined. As a result, a state in which the test lens is sandwiched between the pair of measurement members 500 is realized. It should be noted that the test lens sandwiched between the measurement members 500 is maintained in its state by the biasing force of the spring 340.

  On the other hand, when removing the test lens from the refractive index measuring instrument 300, the user operates the end of the operation unit 311 to be close to the operation unit 331. Thereby, the space | interval of the contact | adherence surface of the upper and lower measuring members 500 spreads, and a to-be-tested lens can be removed.

  Also in this embodiment, the user can measure the refractive index of the test lens according to the refractive index measurement procedure described in the first embodiment.

[Action / Effect]
The operation and effect of the refractive index measuring instrument 300 according to this embodiment will be described.

  According to the refractive index measuring instrument 300, after the measuring member 500 is mounted on the refractive index measuring instrument 300, it is not necessary to hold the measuring member 500 directly with a finger. It can suppress adhering. Further, it is possible to prevent a decrease in measurement accuracy due to adhesion of dirt.

  In addition, since the work for removing the release paper and the attaching work can be performed with the measuring member 500 mounted on the refractive index measuring instrument 300, the handling of the measuring member 500 in these work can be facilitated. Furthermore, it is possible to suppress the situation where dirt such as fingerprints adheres to the measuring member 500 during these operations.

  Further, when the test lens to which the measurement member 500 is attached is placed on the lens meter 1000 or removed from the lens meter 1000, the test lens itself is not held by a finger as in the prior art, but the refractive index. Since operations can be performed while holding the measuring instrument 300, it is possible to facilitate these operations.

  In addition, the pair of upper and lower measurement members 500 are attached to the refractive index measuring instrument 300 so that the close contact surfaces thereof are substantially parallel to each other. At this time, each contact surface is substantially orthogonal to the vertical direction. The refractive index measuring instrument 300 is configured to relatively move the movable part 320 and the fixed part 332 in the vertical direction. Thereby, according to the instrument 300 for refractive index measurement, the space | interval of the contact surface of a pair of upper and lower measurement members 500 can be changed, maintaining a mutual contact surface substantially parallel.

  In addition, the structure in which the protrusions 314 freely move in the openings 321 contributes to the fact that the contact surfaces are maintained substantially parallel to each other. That is, when the operation units 311 and 331 are operated, the movable unit 320 receives a force in a direction other than the vertical direction, but the projection 314 freely moves in the opening 321 to release this extra force. Because it can.

  As described above, according to the refractive index measuring instrument 300, when the measuring member 500 is brought into close contact with the test lens, the close contact surface can be sandwiched between the test lenses while maintaining the orientation of the close contact surface substantially in parallel. Therefore, regardless of the shape of the lens surface of the test lens, the test lens can be securely sandwiched by the measuring member 500. Further, it is possible to remove bubbles between the gel body 510 and the transparent plate 520 or between the gel body 510 and the lens to be examined, and it is possible to prevent new bubbles from being formed. .

  As described above, according to the refractive index measuring instrument 300, it is possible to prevent the generation of bubbles between the members to be adhered, and it is possible to prevent the adhesion of dirt, thereby preventing a decrease in the accuracy of the refractive index measurement of the lens material. Is possible.

  In addition, the refractive index measuring instrument 300 includes the spring 340 (biasing means) that biases the arms 310 and 330 in a direction in which the end of the operation unit 311 and the operation unit 331 are separated from each other. The spring 340 acts to narrow the interval between the close contact portions of the measurement member 500 mounted on the tips of the arms 310 and 330, respectively. Thereby, even when the user does not apply force to the operation units 311 and 331, the state in which the lens to be examined is sandwiched between the pair of upper and lower measurement members 500 is maintained. Therefore, the test lens is not detached when the lens meter 1000 is used for measurement. Further, it is not necessary to keep applying force to sandwich the test lens.

  Further, the arm 330 of the refractive index measuring instrument 300 is bent in a direction approaching the arm 310 after being bent in a direction away from the arm 310 from the tip toward the rotation shaft 313 and rotated. The shaft 313 is connected to the arm 310. This can prevent the arm 330 from contacting the lens to be examined.

  In this embodiment, only the lower arm 330 has the above curved shape, but a similar curved shape can be applied to the upper arm 310. That is, it is bent in a direction away from the lower arm from the tip toward the rotating shaft, then bent in a direction approaching the lower arm, and connected to the lower arm by the rotating shaft. It is possible to use a simple upper arm.

  In this embodiment, the configuration in which the position of the measurement member attached to the lower arm is fixed and the measurement member attached to the upper arm is moved in the vertical direction has been described. However, the present invention is not limited to this. Absent. For example, the position of the measurement member attached to the upper arm is fixed and the measurement member attached to the lower arm is moved in the vertical direction, or the measurement member attached to both the upper and lower arms is moved up and down relatively. It is possible to adopt a configuration that moves in the direction.

It is a schematic side view showing an example of the whole structure of embodiment of the instrument for refractive index measurement which concerns on this invention. It is a schematic top view showing an example of a structure of the measurement member holding | maintenance part in embodiment of the instrument for refractive index measurement which concerns on this invention. It is a schematic perspective view showing an example of the attachment aspect of the measurement member with respect to the measurement member holding | maintenance part in embodiment of the instrument for refractive index measurement which concerns on this invention. It is a schematic side view showing an example of the holding | maintenance aspect of the to-be-tested lens in embodiment of the instrument for refractive index measurement concerning this invention. It is the schematic showing an example of a structure of the measurement member in embodiment of the instrument for refractive index measurement which concerns on this invention. FIG. 5A is a schematic side view of the measurement member, and FIG. 5B is a schematic top view of the measurement member. It is a schematic perspective view showing an example of the whole structure of the lens meter used for the measurement of the refractive index of the lens material of the test lens held by the embodiment of the refractive index measuring instrument according to the present invention. It is the schematic showing an example of a structure of the optical system mounted in the lens meter used for the measurement of the refractive index of the lens raw material of the to-be-tested lens hold | maintained by embodiment of the instrument for refractive index measurement concerning this invention. . It is the schematic showing an example of a structure of the optical system mounted in the lens meter used for the measurement of the refractive index of the lens raw material of the to-be-tested lens hold | maintained by embodiment of the instrument for refractive index measurement concerning this invention. . FIG. 8A is a schematic diagram illustrating the configuration of the Hartmann plate, and FIG. 8B is a schematic diagram illustrating the configuration of the four-hole plate. It is a schematic side view showing the modification of the form of the arm in embodiment of the instrument for refractive index measurement which concerns on this invention. It is a schematic side view showing the modification of the form of the arm in embodiment of the instrument for refractive index measurement which concerns on this invention. It is a schematic perspective view showing the modification of the form of the measurement member in embodiment of the instrument for refractive index measurement which concerns on this invention. FIG. 11A is a schematic view of a modification of the flat plate, and FIG. 11B is a schematic view of a modification of the gel body. It is the schematic showing the modification of the form of the measurement member holding | maintenance part in embodiment of the instrument for refractive index measurement which concerns on this invention. FIG. 12A is a schematic top view of a modified example of the measurement member holding part, and FIG. 12B is a schematic side view of the measurement member holding part. It is a schematic perspective view showing an example of the whole structure of embodiment of the instrument for refractive index measurement which concerns on this invention. It is a schematic perspective view showing an example of the attachment aspect of the measurement member with respect to the measurement member holding | maintenance part in embodiment of the instrument for refractive index measurement which concerns on this invention. It is a schematic perspective view showing an example of composition and operation of an embodiment of a refractive index measuring instrument concerning the present invention. It is a schematic perspective view showing an example of composition and operation of an embodiment of a refractive index measuring instrument concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,300 Refractive index measuring instrument 2, 3, 310, 330 Arm 20A, 30A Support arm 2A, 3A, 311, 331 Operation part 2B, 3B, 322, 323, 333, 334 Measurement member holding part 21, 31 1st Holding frame 22, 32 Second holding frame 23, 33 Rotating shaft 2 a, 3 a, 4, 313 Rotating shaft 5, 340 Spring 100, 500 Measuring member 110, 510 Gel body 110 a Fringe section 120 Flat plate 130 Bonded frame 335 Columnar shape Member 1000 Lens meter A1, A2, B1, B2 Axis L Test lens La Surface Lb Back surface

Claims (14)

A first measurement member including a first adhesion member having a known refractive index that is in contact with one surface of the lens to be tested is transparent and flexible, and is transparent and flexibility in contact with the other surface of the lens to be examined. And a second measuring member including a second contact member having a known refractive index and a refractive index measuring instrument used for measuring a refractive index of a lens material forming the lens to be examined. There,
The first contact member closely contacting the one surface of the test lens and the second contact member closely contacting the other surface are opposed to each other. A first measurement member holding portion for holding one measurement member and a second measurement member holding portion for holding the second measurement member;
The first measurement member holding portion and the second measurement member holding portion are relatively moved so as to change the interval between the close contact surface of the first close contact member and the close contact surface of the second close contact member. A moving mechanism for making
With
Used for the measurement of the refractive index in a state where the test lens is sandwiched between the first contact member and the second contact member;
Refractive index measuring instrument characterized by the above. The moving mechanism unit changes the interval between the two contact surfaces while maintaining the contact surface of the first measurement member and the contact surface of the second measurement member substantially in parallel.
The instrument for refractive index measurement according to claim 1. The moving mechanism section is provided with the first measurement member holding section at the distal end, the first arm having the first operation section at the distal end, and the second measurement member holding section at the distal end. A second arm having a second operating portion on the side, a pivot shaft connecting the first arm and the second arm, and substantially orthogonal to the two contact surfaces from the first arm A columnar member extending in a direction, and an insertion portion provided in the second arm, through which the columnar member is inserted,
When the first and second operation portions are operated, the first arm and the second arm rotate relative to each other about the rotation shaft, and the columnar member and the insertion portion , The distance between the two contact surfaces is changed by relatively moving in the substantially orthogonal direction,
The instrument for refractive index measurement according to claim 2. The second arm includes a movable portion provided with the second measurement member holding portion at a distal end and a distal end connected to one end of the second operation portion,
The second operation portion has a bent shape having a protruding portion protruding toward the first arm,
The pivot shaft connects the second arm to the first arm at the protrusion,
When the first operation unit and the other end of the second operation unit are brought close to each other, one end of the second operation unit is separated from the first arm by rotation about the rotation axis. The movable part is separated from the first arm, the two contact surfaces are separated,
When the first operation portion and the other end of the second operation portion are separated from each other, one end of the second operation portion comes close to the first arm by rotation about the rotation axis. The movable part is close to the first arm, and the two contact surfaces are close to each other.
The instrument for refractive index measurement according to claim 3. The moving mechanism unit includes a biasing unit that biases the first and second arms in a direction in which the first operation unit and the other end of the second operation unit are separated from each other.
The refractive index measuring instrument according to claim 4. The first arm is bent in a direction approaching the second arm after being bent in a direction away from the second arm from the tip toward the rotation axis, and the rotation Connected to the second arm by a shaft;
The instrument for refractive index measurement according to any one of claims 3 to 5, wherein: The second arm is bent in a direction approaching the first arm after being bent in a direction away from the first arm from the tip toward the rotation axis, and the rotation. Connected to the first arm by a shaft;
The instrument for refractive index measurement according to any one of claims 3 to 5, wherein: The moving mechanism unit includes a rotation shaft and two arms connected to each other by the rotation shaft and each having an operation unit,
The first measurement member holding portion is provided at the tip of one of the two arms,
The second measurement member holding portion is provided at the tip of the other arm,
When the two arms rotate relative to the rotation axis in response to an operation on the operation unit, the first measurement member held by the first measurement member holding unit is closely attached. The distance between the surface and the contact surface of the second measurement member held by the second measurement member holding portion is changed.
The instrument for refractive index measurement according to claim 1. The two arms are connected so as to cross each other on the rotating shaft,
The instrument for refractive index measurement according to claim 8. In the two arms, both ends of one arm are positioned in the same direction with respect to the rotation axis, and both ends of the other arm are positioned in the opposite direction to the rotation axis. Connected,
The instrument for refractive index measurement according to claim 8. The two arms are connected to each other at the end opposite to the tip by the rotating shaft.
The instrument for refractive index measurement according to claim 8. The first measuring member includes a transparent flat plate-like first flat plate member and the first close contact member so that the first flat plate member is brought into close contact with the contact surface of the close contact surface of the first close contact member. And a first frame that sandwiches the edge of the first flat plate member,
The second measuring member includes a transparent and flat plate-like second flat plate member, and the second close contact member so that the second flat plate member is in close contact with an opposite surface of the close contact surface of the second close contact member. And a second frame for sandwiching the edge of the second flat plate member and the second frame member,
The first measurement member holding unit includes a first holding unit that holds the first frame body,
The second measurement member holding unit includes a second holding unit that holds the second frame.
The instrument for refractive index measurement according to claim 1. The first measurement member further includes a transparent and flat plate-like first flat plate member that is in close contact with the facing surface of the close contact surface of the first close contact member,
The second measurement member further includes a transparent and flat plate-like second flat plate member that is in close contact with the facing surface of the close contact surface of the second close contact member,
The first measurement member holding portion includes a first holding portion for holding the first flat plate member,
The second measurement member holding unit includes a second holding unit that holds the second flat plate member.
The instrument for refractive index measurement according to claim 1. The moving mechanism unit includes two arms,
The first measurement member holding portion is provided at the tip of one of the two arms so as to be movable with respect to the one arm.
The second measurement member holding portion is provided at the tip of the other arm so as to be movable with respect to the other arm.
The instrument for refractive index measurement according to claim 1.

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