JP2005156174A - Lens meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens meter capable of evacuation-positioning a nose block used for measuring a PD value not to disturb measuring work for a degree of a lens or the like when not used, and capable of moving laterally beyond over a nose piece without lifting up greatly spectacles upwards when measuring the PD value. <P>SOLUTION: In this lens meter, the nose block 48 is connection-supported turnably around a lower edge part with respect to a slide arm 50 slidable along a lateral direction to a lens table 34, the spectacles 62 are made to get in from an under side of the nose block 48 to be engaged, and the nose block 48 is evacuated under a vertically suspended condition in an under side of the lens table 34, when measuring the degree of the lens or the like. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lens meter capable of measuring the lens power of a spectacle lens framed in spectacles and the distance between optical axes of left and right lenses (also referred to as PD value).

  Conventionally, as a kind of lens meter for measuring optical characteristics such as lens power by transmitting a measuring beam through a spectacle lens, it is possible to measure the distance between the optical axes of left and right lenses encased in spectacles. ,Proposed. For example, those disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 8-271378), Patent Document 2 (Japanese Patent No. 3195654), and Patent Document 3 (Japanese Patent No. 3434941) are examples thereof.

  Such a lens meter is generally provided with a nose piece that is located in front of a box-shaped casing and has a light exit or light entrance for a measuring light beam facing upward. Optical characteristics are measured by placing a lens to be tested on a piece and transmitting a measuring beam. In addition, a lens table having a substantially vertical guide surface is mounted so as to be movable in a protruding / retracting direction from the front surface of the housing toward the nosepiece. The edge portion or the lower edge portion can be positioned by contacting the guide surface of the lens table. In addition, a nose block is provided that can move in the left-right direction along the lens table, and a mechanism for measuring the movement distance of the nose block in the left-right direction is provided. When the optical axis of one of the left and right spectacle lenses is positioned on the nose piece in the engaged state, the optical axis of the other spectacle lens is positioned on the nose piece by moving the spectacles. The PD value can be measured by measuring the movement distance of the glasses in the left-right direction.

  By the way, the nose block needs to be able to be moved together with the spectacle frame while maintaining the engagement state easily with respect to the spectacle frame moved to the left and right along the lens table when measuring the PD value. Thus, it is necessary to avoid the interference with the nose piece projecting from below and to be moved to the left and right beyond the nose piece.

  Therefore, in Patent Documents 1 to 3, the nose block is pivotably supported around the support shaft provided near the upper edge of the lens table, and a biasing force in the rotational direction is exerted on the nose block. There has been proposed a structure in which an urging means is provided so that the nose block can be elastically held in a protruding position that protrudes forward by rotating approximately 90 degrees upward from the downward hanging position. Yes. In other words, in the nose block having such a structure, it is possible to engage the nose pads of the glasses by overlapping them from above, and further press the glasses frame downward to move downward from the protruding position of the nose block. The eyeglass frame is allowed to be displaced downward based on the elastic rotation of the eyeglass, so that the eyeglass lens can be placed on the nose pad. On the other hand, when the spectacle frame is moved to the left and right during the measurement of the PD value, the nose block is also rotated upward while maintaining the engagement with the nose pad by the biasing force by lifting the spectacle frame. Therefore, the nose pad can be moved while avoiding the nose block upward.

  In Patent Document 2, a mechanism such as a cam mechanism or a rack and pinion mechanism is used to displace the nose piece so as to escape downward when the nose block is displaced in the left-right direction when measuring the PD value. Although an avoidance mechanism is also disclosed, such an avoidance mechanism is complicated in structure, and there is a possibility that optical accuracy may be lowered by displacing a nose piece forming an optical path of a measurement light beam. is not.

  By the way, the nose block is required when measuring the PD value, and is not necessary when measuring only the lens power of the lens to be measured, for example, and is likely to interfere with the measurement work. In addition, when the nose block is not used, it may be possible to position the nose block on the lens table most outward in the left-right direction. However, in general, the lens table is not so long on the left and right, and the nose block protrudes forward. Even if the nose block is positioned at the outermost position on the lens table, the measurement work such as the lens power is likely to be hindered. Therefore, when the nose block is not used, it is required that the nose block can be retracted to a position that does not interfere with the measurement work.

  In order to cope with such a request, for example, in Patent Document 1, a structure in which the nose block is opposed to a state in which the nose block hangs down along the front surface of the lens table by using the magnetic force of a permanent magnet is used. Has been proposed. Moreover, in patent document 3, the 2nd rotating shaft located in the back rather than a lens table front surface is provided, and the nose block urged | maintained by the forward projecting state around this 2nd rotating shaft is provided. As a whole, a structure has been proposed in which the lens table is rotated so as to be lifted upward so as to escape the front surface of the lens table so that the lens table is retracted to protrude upward from the upper surface of the lens table.

  However, in the former structure disclosed in Patent Document 1, since the nose block is placed on the front surface of the lens table and positioned, for example, when measuring the lens power of the spectacle lens, the upper edge portion or lower portion of the spectacle frame is measured. There is a problem that the operation of positioning the edge portion in contact with the front surface of the lens table is hindered. Moreover, in the structure of the latter patent document 3, the space above the nosepiece is originally a work space required for the measurement work, and protrudes from the lens table into this work space. If the nose block is held in this manner, there is a possibility that the measurement operation may be hindered, and the nose block or the eyeglasses may be damaged by hitting fingers or glasses during the measurement. In other words, when measuring the lens power of the spectacle lens, the space above the nosepiece is placed by guiding the spectacles gripped with fingers from the top onto the nosepiece or moving the spectacles gripped with fingers from side to side. In the case of spectacles in which the left and right spectacle lenses are sequentially placed on the nosepiece, and further equipped with a multifocal lens, as described in, for example, Japanese Patent Laid-Open No. 2000-266639, the optical characteristics of one spectacle lens are described. This is the main space necessary for various operations, such as moving the glasses held by fingers to the front, back, left, and right to measure the characteristics at multiple positions. As a result, the space above the nosepiece inevitably requires a sufficient space for measurement work.

  In addition, the conventional nose blocks described in Patent Document 1 and Patent Document 3 described above are both structures that are pivotably suspended at the upper edge, and the nose pads of the glasses overlap from above. As described above, when measuring the PD value, the nose block is moved from the upper end of the nose piece in order to move the nose block left and right while avoiding interference with the nose piece. When the lens is further rotated upward, the glasses superposed on the nose block are positioned further above the nose block. For that purpose, the spectacles must be lifted to the upper side, and the spectacle lens is easily brought into contact with a pressing pin or the like that is disposed above the nose piece and presses and positions the spectacle lens on the nose piece. There is a possibility that the eyeglass lens may be scratched by such contact, and the work is required to be very careful. Therefore, there is a problem that it is not always easy to use.

JP-A-8-271378 Japanese Patent No. 3195654 Japanese Patent No. 3434941

Here, the present invention has been made in the background as described above, the place to solve the problem,
(I) The nose block used for measuring the PD value is retracted to a state where it does not interfere with the measurement work such as the lens power when the PD value is not used, thereby improving measurement workability and preventing damage to the nose block. Can be effectively achieved,
(Ii) When measuring the PD value, it is not necessary to lift the spectacles upward even when moving left and right beyond the nosepiece, and it can be easily measured and the spectacle lens is effectively damaged. Can be prevented,
The object is to provide a lens meter having a novel structure.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

(Aspect 1 of the present invention)
According to the first aspect of the present invention, a nosepiece on which a spectacle lens to be measured is placed is provided in front of the housing, and a lens table having a substantially vertical guide surface on the front surface is provided from the housing to the nosepiece. In a state of being able to move in a protruding / retracting direction toward the lens, with the upper or lower edge of the glasses on which the spectacle lens is mounted positioned in contact with the guide surface of the lens table, The lens meter, wherein the spectacle lens is placed on the nose piece, and the lens power of the spectacle lens is measured by transmitting the measuring light flux through the nose piece to the spectacle lens. A slide arm disposed below the table and movable in the left-right direction along the lens table; and a moving distance of the slide arm on the lens table is measured. And a nose block attached to the front end of the slide arm so that the nose block is held in a protruding position protruding forward from the slide arm. By applying the glasses from below the held nose block, the nose block fits from above into the vicinity of the nose of the glasses and is engaged in the lateral direction, and the displacement of the glasses in the lifting direction is An external force is applied to the nose block held at the protruding position with the glasses removed from below the nose block, while allowing an upward rotation from the protruding position of the block. The nose block is forcibly turned downward by exerting on the slide arm so that it hangs downward from the front end of the slide arm. The lens meter be led by allowed to hold the hanging position to be able to have characterized.

  In the lens meter constructed according to this embodiment, the lower end edge of the nose block is supported in the vicinity of the lower end edge of the lens table and is disposed so as to be able to rotate upward when measuring the PD value. Will be. In this manner, in contrast to the nose block suspended and supported by the upper end edge of the conventional structure, the nose block is supported by rising at the lower end edge in this aspect. It can enter from the lower side and can be engaged, whereby the spectacles are positioned below the nose block.

  Therefore, even when the nose block is moved to the left and right beyond the nose piece when measuring the PD value, it is possible to avoid interference of the nose block with the nose piece without lifting the glasses so much. Therefore, even if a pressing pin or the like is disposed above the nosepiece, the contact of the glasses with such a member can be easily avoided, and the damage of the glasses when measuring the PD value is advantageously prevented. To get.

  Further, when the nose block is not used in the lens meter structured according to this aspect, the nose block is moved downward from the front surface of the lens table by rotating the nose block downward, and is lower than the nose piece. The retreat position is set in the area. Therefore, for example, when measuring the lens power, the front surface of the lens table can be freely used for positioning of the glasses, and the glasses guided and placed from above on the nosepiece, The nose block does not interfere with the eyeglasses removed from the top of the piece, and the work area can be advantageously secured, and the finger or the like hits the nose block. The resulting damage is also effectively prevented.

  In addition, when placing the spectacle lens on the nosepiece and positioning the target measurement position on the measurement light beam, the operator (examiner) generally works by looking into the nosepiece obliquely from above. However, at that time, the nose block that is retracted and positioned below the nosepiece is completely removed from between the operator and the nosepiece, so that the operator can move from any location above. Even if you look into it, the line of sight to the measurement area is not blocked by the nose block, and the visibility to the spectacle lens and the spectacle frame existing in the work area can be stably and advantageously secured.

(Aspect 2 of the present invention)
Aspect 2 of the present invention is characterized in that, in the lens meter according to aspect 1, urging means for urging the nose block downward toward the projecting position is provided.

  In the lens meter constructed according to this aspect, the engagement state of the nose block with respect to the nose pad of the glasses that are overlapped and engaged so as to be applied from below the nose block uses the urging force of the urging means. Thus, it can be held more advantageously. As the biasing means, for example, a leaf spring or a coil spring can be adopted. However, in the lens meter according to the first aspect, such an urging means is not necessarily required, and for example, the nose block is rotated downward (projecting position side) from the raised state based on the action of gravity. By utilizing this, it is possible to maintain the engaged state of the nose block with respect to the nose pad or the like.

(Aspect 3 of the present invention)
According to Aspect 3 of the present invention, in the lens meter according to Aspect 1 or 2, when the nose block is held at the protruding position, the nose block is inclined obliquely upward by a predetermined amount from the horizontal plane. And projecting forward.

  In such a lens meter structured according to this aspect, when measuring the PD value, the spectacles from the front of the nose block are put on when the spectacles nose pad and the like are overlapped below the nose block. It becomes easy to insert, and a series of operations for measuring the PD value after engaging the glasses with the nose block can be performed more easily.

(Aspect 4 of the present invention)
Aspect 4 of the present invention is the lens meter according to any one of the aspects 1 to 3, wherein an accommodation recess for accommodating the lens table at the retracted position is formed on the front wall surface of the housing. The nose block is positioned below the opening of the housing recess in the suspended position and is substantially along the front wall surface of the housing in a state where the lens table is housed in the housing recess. It is characterized by being able to hang down and be positioned.

  In a lens meter structured according to this embodiment, the lens table does not protrude much from the front wall of the housing during measurement without using the lens table, or during transportation or storage of the lens meter. Or it can accommodate in the state which does not protrude substantially. At that time, since the nose block is positioned outside the housing recess, many parts of the lens table, preferably the whole, can be housed in the housing recess without disturbing the nose block. It is. In addition, the nose block is disposed along the front wall surface of the lens table in the accommodation state in the accommodation recess of the lens table. For example, when the lens table is not used as described above or when the lens meter is transported During storage, the nose block does not get in the way, and damage or the like can be advantageously avoided.

(Aspect 5 of the present invention)
According to a fifth aspect of the present invention, in the lens meter according to any one of the first to fourth aspects, the nose block is configured such that the rotating arm is rotated upward from the protruding position to be an upright position. A lock mechanism is provided that can be positioned substantially along the guide surface of the lens table and that holds the nose block to the lens table and holds the nose block in the upright position. To do.

  In the lens meter having the structure according to this aspect, for example, when measuring without using the lens table, or when transporting or storing the lens meter, the nose block is stacked on the front surface of the lens table. It becomes possible to hold the state as a retracted state. Therefore, the retracted state rising along the front surface of the lens table and the retracted state depending on the lower end edge of the lens table as described above are the conditions at the time of measurement, the taste of the examiner, or at the time of transportation or storage. It can be selectively employed according to time conditions.

(Aspect 6 of the present invention)
Aspect 6 of the present invention is the lens meter according to any one of aspects 1 to 5, wherein the lens meter rotates about a first rotation axis extending in a moving direction of the slide arm with respect to a front end portion of the slide arm. A pivot arm is attached to the pivot arm so that the pivot arm is positioned and held at the upper pivot position and the lower pivot position around the first pivot axis. The nose block is attached to the tip of the head so as to be rotatable around a second rotation axis parallel to the first rotation axis, and the rotation arm is held at the upper rotation position. The nose block is pivotally displaced about the second pivot shaft upward from the protruding position under the condition, and the pivot arm is pivoted to the lower pivot position. The nose block that was in the protruding position Lens meter according to any one of claims 1 to 5 and guided to the hanging position.

  In the lens meter structured according to this aspect, the characteristics of the pivoting operation of the pivoting arm around the first pivoting axis and the characteristics of the pivoting operation of the nose block around the second pivoting axis are shown. By setting separately, it is possible to easily perform a relatively free turning operation from the protruding position of the nose block as described above and a restrictive rotating operation from the protruding position of the nose block to the hanging position. And it becomes possible to set advantageously. For example, the rotation operation of the rotation arm around the first rotation axis is limited by frictional force or appropriate locking means, and the rotation operation of the nose block around the second rotation axis is easy. By allowing the rotation, the state where the nose block can be advantageously used for the measurement of the PD value is expressed under the state where the rotation arm is fixedly held with respect to the upper rotation position. Under the condition that the pivot arm is fixedly held with respect to the lower pivot position, a state in which the nose block can be advantageously held at a retracted position that does not interfere with measurement or the like that does not use it is expressed. Become.

  In this aspect, the urging means according to aspect 2 may be constituted by an urging means that urges the nose block downward (projecting position) around the second rotation axis. In this aspect, in order to position and hold the rotating arm at the upper rotating position and the lower rotating position, for example, a frictional resistance around the first rotating shaft of the rotating arm is used. In addition, for example, the rotation arm is held with a sense of moderation with respect to at least one of the upper rotation position and the lower rotation position around the first rotation axis. A caulking moderation mechanism is preferably employed. As such a moderation mechanism, for example, a detachable locking portion such as an unevenness is provided between the rotation arm and the slide arm, or the rotation arm is moved to any rotation position using a spring means. This can be realized by providing an elastic holding mechanism (for example, an elastic positioning mechanism of both operation portions in a known binder clip can be applied) that selectively elastically holds. In this way, by employing special means for holding the rotating arm at the upper and lower rotating positions, the rotating arm can be prevented from rotating unnecessarily, and the rotating arm can be prevented. Therefore, the nose block can be more reliably guided to the measurement position of the PD value where it is used and the retracted position where it is not used. It can be done.

(Aspect 7 of the present invention)
Aspect 7 of the present invention is the lens meter according to aspect 6, wherein the first rotation shaft and the second rotation shaft are both substantially the same as or in front of the guide surface of the lens table. It is characterized in that it is positioned at.

  In such a lens meter structured according to this aspect, the pivoting operation of the pivoting arm and the nose block around the first and second pivoting shafts is sufficient without causing problems due to interference with the lens table. It can be realized advantageously over a wide angular range. In particular, this aspect is suitably employed in combination with the above aspect 4, whereby the nose block is placed on the front wall surface of the housing even when the lens table is substantially completely accommodated in the accommodation recess. It is possible to hang down and move to the retracted position so as to be close to each other.

(Aspect 8 of the present invention)
Aspect 8 of the present invention is the lens meter according to any one of aspects 1 to 5, wherein the lens meter is rotatable with respect to the front end of the slide arm about a direct support shaft extending in the moving direction of the slide arm. A direction in which the nose block is held at the protruding position and rises upward from the nose block by mounting the nose block and making the rotational resistance of the nose block around the direct support shaft different within a predetermined angular range. In the direction where the nose block hangs downward from the protruding position, it is difficult to be rotated and displaced with a large frictional resistance, and is held at the protruding position. The nose block can be guided to the hanging position by applying an external force to the nose block and forcibly turning it downward. That it was, and features.

  In the lens meter structured according to this aspect, the nose block protruding mechanism that can be used for the measurement of the PD value and the state in which the nose block is not used by the rotation mechanism of the nose block around a single support shaft. The present invention as described above, which can selectively provide the retracted state of the nose block, can be advantageously realized with a simple structure. That is, based on the relatively free rotation of the nose block upward from the protruding position, the above-described PD value measurement using the nose block can be advantageously performed, while the nose block protruding. By restricting the downward rotation from the position, the nose block can be advantageously positioned and held in the protruding state used for the PD value measurement and in the retracted state not used for the measurement. is there.

  In this aspect, the urging means according to aspect 2 may be configured by an urging means that urges the nose block downward (projecting position) directly around the support shaft. The magnitude of the urging force by the urging means is set in consideration of the frictional resistance so that the nose block is not rotated below the protruding position.

  Further, in this aspect, when the nose block is pushed down with a finger, it is perceived that the nose block is rotated to the hanging position, or the nose block is more stably positioned and held at the hanging position. For example, for example, a concave / convex locking mechanism for locking the nose block at the hanging position is positioned between the slide arm and the nose block, or rotational frictional resistance around the direct support shaft of the nose block is provided. A moderation mechanism may be provided by making it small only at the hanging position.

(Aspect 9 of the present invention)
Aspect 9 of the present invention is the lens meter according to aspect 8, wherein one of the slide arm and the nose block forms an arcuate friction surface extending in the circumferential direction around the direct support shaft, On the other of the slide arm and the nose block, a sliding contact surface is formed that slides on the friction surface when the nose block rotates around the direct support shaft, and the radius of curvature of the friction surface around the direct support shaft is set in the circumferential direction. The sliding resistance of the sliding contact surface with respect to the friction surface is varied in accordance with the rotational position of the nose block around the direct support shaft.

  In this embodiment, both the rotation operation under the small frictional resistance upward from the protruding position of the slide arm and the rotation operation under the large frictional resistance downward from the protruding position are both continuous. Thus, a single friction surface extending in the circumferential direction can be easily realized with a simple structure, and further simplification of the structure can be achieved. In this aspect, it is preferable that a pair of friction surfaces and sliding contact surfaces that are brought into sliding contact with each other during rotation about one axis of the nose block and are directly positioned at both ends in the longitudinal direction of the support shaft are formed. As a result, the rotation operation of the nose block can be stabilized.

(Aspect 10 of the present invention)
Aspect 10 of the present invention is characterized in that, in the nose block according to aspect 8 or 9, the direct support shaft is positioned substantially the same as or in front of the guide surface of the lens table.

  In this aspect, when the nose block is rotated around the direct support shaft, the interference of the nose block to the lens table can be advantageously avoided. In particular, by adopting this aspect in combination with the above aspect 4 Even in a state where the lens table is almost completely accommodated in the accommodation recess, the nose block can be lowered and placed in the retracted position along the front wall surface of the housing.

  As is apparent from the above description, in the lens meter constructed in accordance with the present invention, the nose block is supported by the slide arm disposed below the lens table, and the nose block protrudes when the PD value is measured. Since it is designed to be able to turn from the bottom of the nose block and engage with it, the nose block can be moved to the left and right beyond the nose piece. Even if the spectacle lens is not lifted so much, the nose block is retracted greatly above the nose piece, and interference with the nose piece can be advantageously avoided, and the spectacle lens with respect to other members disposed above the nose piece can be prevented. Damage due to interference can be effectively prevented.

  In addition, in the lens meter configured according to the present invention, when the nose block is not used, the nose block is removed from the front surface of the lens table downward, and is retracted to a region below the nose piece. For example, when measuring lens power, the front of the lens table and the work space located above the lens table and nosepiece can be used freely and without being disturbed by the nose block. In addition, it is possible to effectively prevent damage caused by hitting a finger or the like against the nose block.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 shows an overall outline of a lens meter 10 according to an embodiment of the present invention. The lens meter 10 includes a substantially box-shaped housing 12. On the front side of the housing 12, the upper part projects forward relative to the lower part, and the upper part 14 projecting like a bowl forms a measurement space 16 that is largely recessed on the entire front surface of the lower part. . In addition, a liquid crystal display screen 18 for displaying the measurement state and measurement results is provided on the protruding front surface of the upper portion 14, and various operation buttons 20 are disposed below the liquid crystal display screen 18. Has been.

  Further, in the measurement space 16, optical path convex portions 22, 24 that are opposed to each other in the vertical direction at the central portion in the width direction are formed to protrude forward. A nosepiece 26 that protrudes upward in a substantially cylindrical shape protrudes from the upper surface of the lower optical path protrusion 24. In the present embodiment, the measurement light beam guided from the light emitting source housed in the housing 12 is projected vertically downward from the upper optical path convex portion 22 and passes through the measurement space 16. The measurement light flux is received by the light receiving element that is incident on the housing 12 through the incident window that opens at the distal end surface of the nosepiece 26 and is housed in the housing 12. That is, measurement points such as a lens power by the measurement light beam are formed on the nosepiece 26.

  Furthermore, a lens presser 28 that protrudes downward toward the nosepiece 26 is mounted on the upper optical path convex portion 22 so as to be movable in the vertical vertical direction, and is based on the rotation and vertical operation of the mark point lever 30. Thus, the marking point portion including the marking point lever 30 can be driven in the vertical direction. In addition, a plurality of (three in this embodiment) lens pressing pins 32 protruding downward are fixed to the lens pressing 28. Then, by displacing the lens presser 28 downward, the plurality of presser pins 32 are integrally lowered and displaced downward.

  As a result, in this embodiment, the lens presser 28 is displaced downward in a state where the spectacle lens is placed on the nosepiece 26 and the measurement point of the optical characteristics such as the lens power is positioned on the nosepiece 26. By doing so, the test lens placed on the nosepiece 26 can be pressed onto the nosepiece 26 with a plurality of lens pressing pins 32 and held in a fixed position.

  Further, a lens table 34 is disposed on the lower front surface of the housing 12 that forms the measurement space 16. The lens table 34 has a longitudinal block shape extending over substantially the entire length in the width direction that is horizontal in the housing 12, and the front surface is a substantially vertical and flat guide surface 36. The lens table 34 is positioned behind the nosepiece 26 (on the housing 12 side), and is positioned behind the measuring light beam. In such a state, the mark point portion including the mark point lever 30 is driven and displaced downward, so that the mark point can be marked at a predetermined position of the lens to be tested by a built-in mark point means (not shown). ing.

  In addition, as shown in FIG. 2, the lens table 34 is provided with a plurality of drive rods 38 that protrude from the rear to the back and extend into the housing 12. Although not clearly shown in the drawing, the rotation operation force of the adjustment lever 40 protruding from the side surface of the housing 12 by the rack and pinion mechanism or the gear mechanism installed in the housing 12 is By exerting on the lens table 34 via these drive rods 38, the lens table 34 is driven and displaced in the front-rear direction of the housing 12 as a whole, and the guide surface 36 is kept vertical with respect to the nose piece 26. The position can be adjusted in the approach / separation direction.

  Furthermore, a groove-shaped accommodation recess 42 is formed on the front surface of the housing 12 so as to extend in the horizontal direction at an intermediate portion in the height direction. The housing recess 42 is located in the back of the nosepiece 26, and a drive rod 38 of the lens table 34 is projected from the bottom surface of the housing recess 42. Then, by positioning the lens table 34 at the innermost position, the lens table 34 enters the receiving recess 42 and can be positioned in a state where it hardly protrudes. That is, the lower front surface of the housing 12 forming the measurement space 16 is separated into an upper front surface 44 and a lower front surface 46 with the accommodating recess 42 interposed therebetween, and the upper and lower front surfaces 44, 46 extend on the same surface. In addition, the guide surface 36 of the lens table 34 is also substantially flush with the upper and lower front surfaces 44 and 46 in the accommodated state.

  Further, a nose block 48 is assembled to the lens table 34 so as to protrude onto the guide surface 36. The nose block 48 has a substantially rectangular plate shape as a whole, and is supported at the lower end edge so as to be rotatable about a rotation axis extending in the horizontal direction, and to the left and right along the lens table 34. It can be displaced in the direction.

  Specifically, as shown in detail in FIG. 3, the lens table 34 has a slide arm that extends downward from the back and extends to a position that protrudes below the guide surface 36 and slightly forward. 50 is provided. The slide arm 50 is guided and supported by guide rails 52 disposed in the longitudinal direction inside the lens table 34, so that the slide arm 50 can be freely slid in the horizontal direction. Further, the position of the slide arm 50 on the guide rail 52 is detected by a position sensor such as an encoder, and the moving distance of the slide arm 50 can be measured.

  Therefore, in the present embodiment, the position sensor and the detection signal calculation means (not shown) constitute measurement means for measuring the moving distance of the slide arm 50 on the lens table 34. . The means for measuring the movement distance of the slide arm 50 in the left-right direction is not limited to an encoder or the like. For example, a scale is fixedly displayed on the lens table 34 in the left-right direction, and a mark is provided on the slide arm 50. Then, by visually observing the position where this mark coincides with the scale on the lens table 34, it is possible to configure such a measuring means by a ruler structure measured by the examiner himself. Alternatively, as a means for measuring the movement distance of the slide arm 50, for example, as described in Patent Document 1 (Japanese Patent Laid-Open No. 8-271378) and Patent Document 3 (Japanese Patent No. 3434941), it is arranged in the left-right direction. It is also possible to use an electric distance detector that detects the position of the slide arm 50 on the provided linear resistor based on the electric resistance value.

  Further, a first rotating shaft 54 extending in the horizontal direction is provided at the front end edge of the slide arm 50 at a position slightly below the guide surface 36 of the lens table 34 and slightly forward. A rotating arm 56 is connected to and supported by the slide arm 50 in a state in which it can rotate around the first rotating shaft 54.

  The rotating arm 56 has a relatively short projecting length of about several mm to 15 mm, and as shown in FIG. It protrudes and can be swung in a swinging manner within an angular range of about 90 degrees or a little over it. In particular, in this embodiment, as shown in FIG. 3, an upward position that rises substantially upward, and as shown in FIG. It can be rotated across both positions. In addition, when the rotating arm 56 rotates about the first rotating shaft 54, sliding contact resistance (friction resistance) between the rotating arm 56 and the first rotating shaft 54 or the slide arm 50 is exhibited. Thus, the rotation position of the rotation arm 56 is stably and fixedly set at the upward position or the downward position. In addition to the sliding contact resistance, the rotation arm 56 is held at the upward position, for example, between the sliding contact surfaces of the rotating arm 56 and the slide arm 50 that are relatively displaced by rotation. By providing a concave portion on one side and a convex portion on the other side, and a moderation mechanism by fitting the convex portion into the concave portion, the rotating arm 56 has two appropriate rotational positions, for example, an upward position and a downward position. It is also possible to adopt a configuration that can be held with a sense of moderation with respect to the rotation position.

  In place of the moderation mechanism, for example, a biasing means such as a leaf spring is mounted between the slide arm 50 and the rotation arm 56, and the rotation arm is positioned in the middle of the rotation direction. Alternatively, it may be guided by being biased to either the upward position or the downward position, and may be elastically held at any of those positions. Alternatively, a moderation mechanism such as a concavo-convex that only holds the rotating arm 56 in the upward position may be provided, and the holding in the downward position may be performed using gravity. In any case, the rotating arm 56 is positioned and held at the above-mentioned upward position and downward position, respectively.

  Furthermore, a second rotation shaft 58 extending in parallel with the first rotation shaft is provided at the projecting tip portion of the rotation arm 56 and can be rotated about the second rotation shaft 58. In this state, the nose block 48 is connected to and supported by the rotating arm 56. The nose block 48 has a substantially flat plate shape, and has a width of about 5 to 20 mm and a length of about 10 to 35 mm. The nose block 48 slightly widens in the protruding direction, and both sides on the front side thereof. A chamfered taper is attached to the edge so that the edge can be stably engaged with the nose pad of the glasses applied from below, as will be described later. As shown in FIG. 3, the nose block 48 is further protruded outward from the second rotation shaft 58, and the second rotation shaft 58 is held in the upward position. In this state, the nose block 48 has a forward projecting position (indicated by a solid line in FIG. 3) that is inclined slightly obliquely upward from the horizontal direction, and a rising position that rises substantially vertically upward. It can be swung in a swinging manner within an angle range between (a position indicated by an imaginary line in FIG. 3).

  In particular, in the present embodiment, a coiled torsion spring 60 as an urging means is extrapolated to the second rotating shaft 58, and one end of the torsion spring 60 is connected to the rotating arm 56 and the nose. By being locked by the block 48, the nose block 48 is always applied with the counterclockwise urging force in FIG. The urging force allows the nose block 48 to be elastically held at the protruding position while the rotating arm 56 is held in the upward position. By lifting 48 upward, the nose block 48 can be rotated and displaced to an arbitrary rotation position around the second rotation shaft 58 in a state where the downward biasing force is always applied. It has become. Thereby, as will be described later, the state of engagement of the spectacles applied from below with the nose pad can be stably maintained, and the nose block 48 engaged with the nose pad is lifted by lifting the spectacles upward. It is rotated about the second rotation axis 58 by an arbitrary angle and lifted upward.

  The urging means for urging the nose block 48 downward about the second rotation shaft 58 is not necessarily provided. For example, the nose block 48 is urged to the protruding position by using gravity. And may be configured to be guided.

  Further, the nose block 48 held in the protruding position while the rotating arm 56 is held in the upward position is shown in FIG. 4 when the rotating arm 56 is rotated in the downward position. As shown in FIGS. 6 to 6, the rotation positions of the rotation arm 56 and the nose block 48 around the first and second rotation shafts 54 and 58 so as to be guided to a hanging position that hangs downward substantially vertically. Is set.

  In addition, a lock-shaped lock stopper 61 is fixed to the lens table 34 so as to extend from the back to the position slightly protruding forward from the upper side of the guide surface 36 at a position off the longitudinal center. ing. Then, as shown in phantom lines in FIG. 3 and as shown in FIG. 7, the nose block 48 is rotated to the upright position with the rotating arm 56 as the upward position. The upper end corner of 48 is engaged with a lock stopper 61 so that the nose block 48 can be held in the upright position against the urging force of the torsion spring 60. That is, in this way, the nose block 48 is positioned and held in a state where it rises along the guide surface 36 of the lens table 34, so that, for example, when the lens meter 10 is transported, the nose block 48 is damaged. Can be prevented.

  In particular, in the present embodiment, since the first and second rotating shafts 54 and 58 are positioned in front of the guide surface 36 of the lens table 34, the nose block 48 held in the suspended position as described above. Is positioned in front of the guide surface 36 of the lens table 34. As a result, as shown in FIGS. 4 to 6, the entire lens table 34 can be accommodated in the accommodation recess 42 without the nose block 48 held in the suspended position interfering. . Further, under such a state in which the lens table 34 is housed, the nose block 48 held in the hanging position follows the front wall surface of the housing 12 from the lower opening edge of the housing recess 42 in the housing 12. It is designed to be positioned in

  Further, since the nose block 48 is used for measuring the PD value (distance between optical axes) of the glasses, when not in use, the guide surface 36 of the lens table 34 is moved downward and held in the suspended position. To be able to be. That is, the nose block 48 in the suspended position is moved downward from the region of the measurement light beam formed above the nose piece 26 and completely removed from the guide surface 36 of the lens table 34 so as to be retracted. It has become. In addition, at the retracted position, the lens table 34 is positioned so as to hang down substantially below the lens table 34 so that the amount of forward projection of the lens table 34 from the guide surface 36 is sufficiently small.

  Thus, by using the lens meter 10 having such a structure, the optical characteristics such as the lens power and the PD value of the left and right spectacle lenses assembled to the spectacle frame can be easily and advantageously measured. It is.

  Specifically, for example, when measuring the PD value, first, as shown in FIG. 8, the lens table 34 is protruded by an appropriate amount by operating the adjustment lever 40. The entire outer surface of the glasses 62 is stably positioned by applying the outer peripheral surfaces of the lower left and right frames of the glasses 62 to the guide surfaces 36 of the glasses 34. At that time, the pair of left and right nose pads provided on the glasses 62 or the vicinity thereof are inserted into the lower side of the nose block 48 and the nose block 48 is pushed up from below, so that the nose block 48 is pushed by the pair of left and right nose pads The nose block 48 is positioned relative to the glasses 62 in the left-right direction while being sandwiched from the left and right.

  In this state, the adjustment lever 40 is operated as necessary to cause the lens table 34 to project and retract in the front-rear direction, and the entire eyeglass 62 is displaced in the left-right direction along the guide surface 36 of the lens table 34. As a result, the right spectacle lens 64 is displaced on the nosepiece 26, and the optical axis of the measurement light beam projected from the opening of the nosepiece 26 matches the optical center that is the measurement target position of the right spectacle lens 64. Align. In this optical alignment, for example, the current measurement point on the right spectacle lens 64 and the optical center as the target position are displayed together on the liquid crystal display screen 18 so that the operation is visually performed. It is desirable to assist. Such a measurement assisting operation is a known technique described in, for example, Japanese Patent Application Laid-Open No. 2000-266639, and a detailed description thereof will be omitted here.

  Then, when the optical axis of the measurement light beam is made to coincide with the optical center of the right spectacle lens 64 in the mounted state on the nosepiece 26, the position of the nose block 48 in the left-right direction is changed to the above-described slide arm 50. It is detected by a position sensor that detects the position of this and stored in the storage means.

  Subsequently, as shown in FIG. 9, the position of the lens table 34 is left as it is, and the entire eyeglass 62 is moved in the left-right direction, so that the left eyeglass lens 66 is noseed as shown in FIG. Position on piece 26. Such an operation is performed by slightly lifting the entire eyeglass 62 to avoid rubbing the left and right eyeglass lenses 64 and 66 against the nosepiece 26.

  At this time, the nose block 48 is moved integrally with the glasses 62 while being sandwiched between the pair of left and right nose pads in the glasses 62. The nose block 48 is pushed upward by the nose pad of the spectacles 62, and the spectacles 62 are lifted a little higher than the nose piece 26. As a result, the nose block 48 can be prevented from interfering with the nose piece 26 by escaping the nose piece 26 upward. It can be moved left and right across.

  Thereafter, the left spectacle lens 66 is placed on the nosepiece 26, and when the optical center thereof coincides with the optical axis of the measurement light beam, as in the case of the right spectacle lens 64 described above, the nose block 48 at that time Are detected by a position sensor that detects the position of the slide arm 50 and stored in the storage means. The distance between the optical axes of the right and left spectacle lenses 64 and 66 is calculated from the position data of the nose block 48 stored when the right spectacle lens 64 is positioned and the position data of the nose block 48 stored when the left spectacle lens 66 is positioned. (PD value) is calculated by the calculation means. The obtained PD value is displayed on, for example, the liquid crystal display screen 18 described above.

  On the other hand, when measuring the optical characteristics such as the spherical lens power, the cylindrical lens power, the addition power, and the cylindrical shaft angle in the spectacle lenses 64 and 66 of the spectacles 62, the lens table 34 is used in the same manner as the above-described PD value measurement. Then, with the reference direction given to the spectacles 62, either the left or right spectacle lenses 64, 66 are placed on the nosepiece 26, and the spectacles 62 are displaced to the left or right along the guide surface 36 of the lens table 34. Thus, measurement is performed by an optical measurement mechanism using the measurement light beam in a state where the measurement position is aligned with the optical axis of the measurement light beam. As such a measurement optical system, a well-known one disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-266639 can be arbitrarily adopted, and thus detailed description thereof is omitted here.

  In the measurement of such optical characteristics, the difference from the above-described measurement of the PD value is that the use of the nose block 48 is not necessarily required. Therefore, when measuring the optical characteristics, as shown in FIG. 5, the nose block 48 is pushed down to be hung below the first rotation shaft 54 positioned below the lens table 34. It is rotated until it reaches a state, and is held in such a hanging position, and is positioned along the lower front surface 46 of the housing 12.

  As a result, the nose block 48 is retracted completely removed from the guide surface 36 of the lens table 34, and the optical path of the measurement light beam is formed, and the left and right eyeglass lenses 64 and 66, which are test lenses, are positioned. From the measurement area above the nosepiece 26, it is retracted to a position completely removed. Therefore, the nose block 48 held in the retracted position as described above is placed for the measurement operation, in particular, by guiding the glasses 62 from the upper side to the nose piece 26 and placing the glasses 62 upward from the nose piece 26. The operation of removing 62 and moving away is not adversely affected, and good workability can be ensured. In addition, since the nose block 48 is retracted below the nosepiece 26, the position of the spectacle lenses 64 and 66 placed on the nosepiece 26 is confirmed so as to be looked into obliquely from above. The person's line of sight is not obstructed or obstructed by the presence of the nose block 48, and the operation interval is very excellent.

  Further, in measuring the PD value, the nose block 48 is rotatably supported at the lower end edge portion, and the glasses 62 are inserted into and engaged with the lower end edge portion. As shown in the figure, the nose block 48 placed on the upper side of the spectacles 62 can be moved to the spectacles even when the nose block 48 is moved to the left and right beyond the nose piece 26. It is larger than 62 and retracted on the nosepiece 26, so that interference with the nosepiece 26 can be avoided. Accordingly, the spectacles may interfere with the lens pressing pin 32 or the like that is disposed above the nosepiece 26 and presses and holds the spectacle lenses 64 and 66 on the nosepiece 26 when measuring the lens power or the like. This can be advantageously avoided, and problems such as damage to the spectacle lenses 64 and 66 when the PD value is measured, that is, peeling of the surface coating material of the spectacle lenses 64 and 66 can be advantageously prevented.

  In particular, the nose block 48 of the present embodiment has a shape that becomes wider as it goes to the front end side in the protruding direction. Therefore, when the spectacles 62 are lifted, the engaging position of the nose block 48 with respect to the spectacles 62 is Along with the movement to the wide front end side of the nose 48, the nose block 48 is retreated and displaced from the nose piece 26 such that the nose block 48 is flipped upwards further.

  Next, FIGS. 11 to 13 show a lens meter as a second embodiment of the present invention. In this embodiment, as compared to the lens meter 10 as the first embodiment described above, another example of the support structure of the nose block 48 by the slide arm 50 is illustrated, and thus the nose block 48 is illustrated. Only the main part related to the support structure will be illustrated in an enlarged manner, and members and parts having the same structure as in the first embodiment will be denoted by the same reference numerals as in the first embodiment. Therefore, the detailed description is omitted.

  In the present embodiment, the front end portion of the plate-like slide arm 50 disposed below the lens table 34 is a saddle plate portion 72 that is bent upward and rises. The lens table 34 is positioned from the lower side of the lens table 34 to the front of the guide surface 36. In addition, a pair of support pieces 74 that protrude forward are integrally formed on the left and right sides of the saddle plate portion 72. A direct support shaft 76 in the form of a circular rod is disposed between the pair of left and right support pieces 74, and the direct support shaft 76 is located at the lower front of the guide surface 36 of the lens table 34. And is supported so as to extend in the horizontal direction parallel to the guide surface 36.

  Further, both end portions in the axial direction of the direct support shaft 76 are protruded outward from the pair of support pieces 74, 74, and the lower end portion of the nose block 48 is connected to the protruding tip portions on both sides. Is supported. That is, a pair of leg portions 78 and 78 are integrally formed at the lower end portion of the nose block 48 so as to protrude from both the left and right sides, and the pair of support portions 78 and 78 project from the slide arm 50. The support shaft 76 is directly inserted into the insertion holes 80, 80 that are overlapped with each other with respect to 74, 74 from the outer sides and penetrated through the both legs 78, 78. Thereby, the nose block 48 is supported so as to be rotatable around the support shaft 76 directly. The direct support shaft 76 can be rotated with respect to at least one of the support pieces 74 and 74 and the legs 78 and 78, so that the rotational displacement of the nose block 48 is allowed. It ’s fine.

  In addition, each support piece 74 has a substantially semicircular outer peripheral surface that extends in the circumferential direction around the central axis of the support shaft 76, and the outer peripheral surface of each support piece 74 has an arc shape. The friction surface 82 is configured. Here, the radius of curvature of the friction surface 82 is partially different in the circumferential direction, and the upper substantially semicircular portion is a small-diameter arc outer peripheral surface 82a, while the lower substantially semicircular portion is a large-diameter arc. The outer peripheral surface 82b is used. In addition, a positioning concave portion 84 having a small diameter in a notch shape is formed in the proximal end portion close to the flange plate portion 72 on the large-diameter arc outer peripheral surface 82b.

  On the other hand, each leg portion 78 of the nose block 48 is integrally formed with a slidable contact projection 86 that protrudes toward the inner surface and extends toward the support piece 74. The front end portion of the sliding contact protrusion 86 is rounded in a semicircular shape and is opposed to the outer peripheral surface (friction surface) 82 of the support piece 74 from the radially outer side. Then, when the nose block 48 is directly rotated around the support shaft 76, the semicircular tip surface 88 of the sliding contact projection 86 moves on the friction surface 82 of the support piece 74 in the circumferential direction and slides. The sliding contact provides a frictional resistance against the rotation of the nose block 48 around the direct support shaft 76. As is clear from this, in this embodiment, the sliding contact surface is constituted by the tip surface 88 of the sliding contact projection 86.

  In particular, in the present embodiment, whether the separation distance of the distal end surface 88 of the sliding contact projection 86 in the radial direction from the central axis of the direct support shaft 76 is substantially the same as the radius of curvature of the small-diameter arc outer peripheral surface 82 a of the support piece 74. It is set to be slightly larger and is set to be smaller than the radius of curvature of the large-diameter arc outer peripheral surface 82 b of the support piece 74. Thereby, when the nose block 48 is rotated, the tip surface 88 of the sliding contact projection 86 hardly contacts the small-diameter arc outer peripheral surface 82a of the support piece 74 according to the rotation position. The large-diameter arc outer peripheral surface 82b of the support piece 74 can be slid while being in contact therewith.

  As a result, the nose block 48 has a tip end surface 88 of the sliding contact projection 86 on the small circular arc outer peripheral surface 82a of the support piece 74 from the protruding position indicated by the solid line in FIGS. By moving, it can be easily rotated with a small resistance. On the other hand, from the protruding position to the suspended position shown by the phantom line in FIG. 11 and shown by the solid line in FIG. Therefore, it can be rotated under a large resistance only by applying an external force downward with fingers. When the nose block 48 is rotated to the hanging position, the distal end surface 88 of the sliding contact projection 86 is fitted into the positioning recess 84 formed in the support piece 74, so that the positioning and holding at the hanging position is maintained. Has been made.

  Therefore, in the lens meter of this embodiment having such a support structure for the nose block 48 as well, the PD value is advantageously measured under the state in which the nose block 48 is disposed at the protruding position, as in the above embodiment. And by rotating the nose block 48 downward from the protruding position, the nose block 48 can be quickly guided to and held at the retracted position depending on the downward direction. Any of the same effects as those of the first embodiment described above can be effectively exhibited.

  In the present embodiment, as in the first embodiment, as shown by a three-dot chain line in FIG. 11, the nose block 48 is rotated upward from the protruding position to guide the lens table 34. The tip of the nose block 48 can be engaged with and held by the lock stopper 61 at the rising position raised along the line 36.

  Although not shown, it is also possible to assemble a biasing means such as a coil spring that biases the nose block 48 from the rising position toward the protruding position. Furthermore, the direct support shaft 76 that is the rotation center axis of the nose block 48 may be provided at a position deviating downward on the guide surface 36 of the lens table 34. Contrary to the present embodiment, an arc-shaped friction surface that extends directly around the central axis of the support shaft 76 is formed on the nose block 48 side, and a sliding contact surface that is in sliding contact with the friction surface is formed on the slide arm 50. It is also possible to form on the side.

  The embodiments of the present invention have been described in detail above. However, these are merely examples, and the present invention is not construed as being limited by specific descriptions in the embodiments. The present invention can be implemented in a mode in which various changes, corrections, improvements, and the like are added based on knowledge, and such a mode is within the scope of the present invention as long as it does not depart from the gist of the present invention. It should be understood that it is included in.

  For example, the specific shapes and sizes of the slide arm 50, the rotating arm 56, and the nose block 48 are not limited in any way, and are appropriately determined in consideration of the shape, structure, size, etc. of the glasses to be applied. Is set.

  Further, a locking mechanism by a lock stopper 61 that locks and holds the nose block 48 in a state of being superimposed on the guide surface 36 of the lens table 34, a housing structure by the housing recess 42 that houses the lens table 34, etc. This is not always necessary in the present invention.

  Furthermore, in the above-described embodiment, the operation procedure for placing the left lens 66 on the nosepiece 26 starting with the right lens 64 of the glasses has been described, but the order of the left and right lenses may be any.

  Further, as is clear from the above description, in the first embodiment described above, the rotation of the rotation arm 56 and the nose block 48 around the first and second rotation shafts 54 and 58 is performed in the second embodiment. In the embodiment, any rotation of the nose block 48 around the direct support shaft 76 is possible regardless of the position of the slide arm 50 on the lens table 34. Thus, the nose block 48 can be rotated and held to the hanging position, but the position where the nose block 48 can be rotated to the hanging position is limited on the lens table 34. May be set.

  Further, when the lens table 34 has a structure that protrudes somewhat forward in the accommodated state in the accommodating recess 42, or when the lens table 34 is accommodated in the accommodated recess 42, the nose block 48 is guided to the hanging position. In the case where there is no such thing, the first rotation shaft 54 in the first embodiment and the direct support shaft 76 in the second embodiment are set and positioned deeper than the guide surface 36 of the lens table 34. May be. In this way, the nose block 48 is hidden under the lens table 34 at the hanging position by setting the first rotation shaft and the direct support shaft to a position behind the guide surface 36 of the lens table 34. In this manner, the retracted position can be achieved.

1 is a perspective view showing an overall schematic structure of a lens meter as one embodiment of the present invention. It is a left view in FIG. FIG. 2 is a right side explanatory view showing an enlarged main part such as a nose block support structure in the lens meter shown in FIG. 1. FIG. 4 is a side view for explaining a retracted state of the nose block shown in FIG. 3. It is a perspective view which shows the retracted state of the nose block in the lens meter shown in FIG. It is a left view in FIG. It is a perspective view which shows the latching state of the nose block in the lens meter shown by FIG. It is a perspective view for demonstrating the measuring method of PD value by the lens meter shown by FIG. It is a perspective view which shows the operation | work state following FIG. 8 in the case of the measurement of PD value measurement. FIG. 10 is a perspective view showing a working state following FIG. 9 in the PD value measurement. It is a side perspective view which shows the support part of the nose block in the lens meter as 2nd embodiment of this invention. It is a perspective explanatory view of the support part of the nose block shown in FIG. FIG. 13 is a perspective explanatory view showing a state different from FIG. 12 of the support portion of the nose block shown in FIG. 11.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lens meter 12 Case 16 Measurement space 18 Liquid crystal display screen 26 Nose piece 32 Lens pressing pin 34 Lens table 36 Guide surface 40 Adjustment lever 42 Housing recessed part 46 Lower front surface 48 Nose block 50 Slide arm 52 Guide rail 54 First turn Moving shaft 56 Rotating arm 58 Second rotating shaft 60 Torsion spring 61 Lock stopper 62 Glasses 64 Right spectacle lens 66 Left spectacle lens 72 Cover plate portion 76 Direct support shaft 78 Leg portion 82 Friction surface 82a Small circular arc outer peripheral surface 82b Large-diameter arc outer peripheral surface 84 Positioning recess 86 Sliding contact projection 88 Tip surface

Claims (10)

A nosepiece on which a spectacle lens to be measured is placed is provided in front of the housing, and a lens table having a substantially vertical guide surface on the front surface is projected / retracted from the housing toward the nosepiece. The eyeglass lens is positioned in contact with the guide surface of the lens table while the upper edge or the lower edge of the eyeglass on which the eyeglass lens is mounted is positioned in contact with the guide surface of the lens table. A lens meter that measures the lens power and the like of the spectacle lens by transmitting the measuring light flux through the nosepiece to the spectacle lens;
A slide arm disposed below the lens table and movable in the left-right direction along the lens table; and a measuring means for measuring a moving distance of the slide arm on the lens table. The nose block is attached to the front end of the slide arm, and the nose block is held at the protruding position protruding forward from the slide arm. By applying the glasses from below, the nose block is fitted in the vicinity of the nose pad of the glasses from above and engaged in the left-right direction, and the displacement of the glasses in the lifting direction is upward from the protruding position of the nose block. Is allowed with a pivoting action toward the front, while the glasses are removed from the bottom of the nose block. By applying an external force to the nose block held in position, the nose block is forcibly rotated downward to be guided to a drooping position hanging downward from the front end of the slide arm and held. A lens meter characterized by being able to do so. The lens meter according to claim 1, further comprising: an urging unit that urges the nose block toward a lower position that is the protruding position. 3. The device according to claim 1, wherein when the nose block is held at the protruding position, the nose block is inclined obliquely upward by a predetermined amount from the horizontal plane and protrudes forward. Lens meter. An accommodation recess for accommodating the lens table in the retracted position is formed on the front wall surface of the housing, and the nose block is in a state where the lens table is accommodated in the accommodation recess. The lens according to any one of claims 1 to 3, wherein the lens is positioned below the opening of the housing recess in the hanging position and is hung down so as to be substantially along the front wall surface of the housing. Meter. The nose block is positioned substantially along the guide surface of the lens table by rotating the turning arm upward from the protruding position to the up position, and the nose. The lens meter according to any one of claims 1 to 4, further comprising a lock mechanism that locks the block with respect to the lens table and holds the block in the standing position. A rotation arm is attached to the front end of the slide arm so as to be rotatable about a first rotation axis extending in the moving direction of the slide arm, and the rotation arm is moved to the first rotation axis. The upper rotation position and the lower rotation position are positioned and held around the axis, and the second rotation parallel to the first rotation axis is made with respect to the tip end portion of the rotation arm. The nose block is mounted so as to be rotatable around the moving axis, and the second nose block is moved upward from the protruding position while the nose block is held at the upper turning position. The nose block, which has been in the protruding position, is guided to the drooping position by rotating the rotating arm to the lower rotation position while rotating the axis around the axis. The lens meter according to claim 1. . The lens meter according to claim 6, wherein each of the first rotation shaft and the second rotation shaft is positioned substantially the same as or in front of the guide surface of the lens table. The nose block is attached to the front end portion of the slide arm so as to be rotatable about a direct support shaft extending in the moving direction of the slide arm, and the nose block is rotated about the direct support shaft. By making the resistance different within a predetermined angle range, the nose block is held at the protruding position and can be easily rotated and displaced with a small frictional resistance in the direction of rising upward from the nose block. In the direction in which the block hangs downward from the protruding position, it is difficult to rotate and displace with a large frictional resistance, and an external force is applied to the nose block held at the protruding position to forcibly rotate downward. The lens meter according to claim 1, wherein the nose block can be guided to the drooping position. In one of the slide arm and the nose block, an arc-shaped friction surface extending in the circumferential direction around the direct support shaft is formed, and in the other of the slide arm and the nose block, the nose block around the direct support shaft Forming a sliding contact surface that is in sliding contact with the friction surface during rotation of the friction surface, and changing a radius of curvature of the friction surface around the direct support shaft within a predetermined angular range in the circumferential direction. The lens meter according to claim 8, wherein the sliding resistance is varied according to a rotational position of the nose block around the direct support shaft. The lens meter according to claim 8 or 9, wherein the direct support shaft is positioned substantially the same as or in front of the guide surface of the lens table.

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