JP2004004368A - Optical component, camera using the component, method for manufacturing its mold, and mold manufactured by the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems: a mold for molding an optical component cannot easily be manufactured and it is difficult to form an optical element on the imaging face of an optical component as designed. <P>SOLUTION: In a roof prism 13b to be disposed at the imaging position of an optical imaging device or near the imaging position, an optical element having at least one pair of opposite inclined planes 17a in a portion which becomes the imaging face or in an emergence face 16<SB>o</SB>close to the imaging position is formed as an index 17, and the optical element which becomes the index 17 is formed in a recessed state with respect to the portion which becomes the imaging face or to the emergence face 16<SB>o</SB>close to the imaging position. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical part arranged at or near an image forming position of an optical image forming apparatus, a camera using the same, a method for manufacturing a mold for molding the optical part, and a method for manufacturing the same. Related to the mold manufactured by the company.
[0002]
[Prior art]
At the image forming position of the finder of the camera in which the automatic focus adjustment mechanism, the exposure meter, and the like are incorporated, a frame-shaped index indicating a distance measuring mark, a light measuring range, and the like is displayed. In many cases, an index such as a crosshair or a distance scale can be displayed at an image forming position of a telescope, a microscope, a range finder, or the like, if necessary.
[0003]
FIG. 19 shows an example of a visual field in such various optical imaging devices, and FIG. 20 shows a cross-sectional structure taken along the line XX-XX. In other words, a portion serving as an image forming surface of the optical component 101 constituting a part of the optical image forming apparatus or a portion close to the image forming position has a ridge line 103 formed along the index 102 and a pair. A prism-shaped optical element 105 having an inclined surface 104 is provided so as to protrude. FIG. 21 schematically shows a state of progress of a light beam incident on a portion of the optical element 105 serving as the index 102. According to this, the light beam L incident on the portion of the optical element 105 is totally reflected on the inclined surface 104 and the traveling direction is largely bent in the lateral direction and does not reach the observer's pupil. The index 102 can be visually recognized as a dark line in such a visual field 106.
[0004]
When the optical component 101 on which the index 102 is formed is produced by injection molding or compression molding, a groove having a V-shaped cross-section obtained by inverting the cross-sectional shape of the index 102 is formed on the molding surface of the mold. There is a need. Conventionally, when such a groove having a V-shaped cross section is carved, a punch to which a diamond chip having a shape corresponding to an index is fixed is manufactured, and the punch is pressed against a molding surface of a mold with a predetermined load, and the mold is pressed. A method of forming a groove by plastically deforming a molding surface of a pyramid-shaped rotary cutting tool having a diamond tip having a shape corresponding to an index, as described in JP-A-2001-162429. A method is known in which a groove is formed by cutting into a molding surface of a mold while cutting and partially removing the molding surface.
[0005]
[Problems to be solved by the invention]
In a conventional optical component which forms an image forming surface of an optical image forming apparatus or is disposed close to an image forming position, a portion which becomes the image forming surface or a portion which is close to the image forming position is used as an index. Is formed in a state in which the optical element to be projected. For this reason, great care must be taken to prevent the optical elements from being damaged when handling the optical components, which is one of the causes of deterioration in workability when assembling the optical components.
[0006]
In order to solve such a problem, it is effective to form the optical element in a state in which the optical element is recessed from the imaging surface of the optical component or a portion close to the imaging position. It is necessary to form a projection of a roof mold having a shape obtained by inverting an optical element to be formed from a molding surface of a mold by using an evaporation method, a plating method, or the like. However, with such a method, it is not possible to form a roof-shaped projection which can satisfy a predetermined shape accuracy on a molding surface of a mold.
[0007]
On the other hand, when the optical component 101 is molded using a mold for molding the optical component 101 as shown in FIGS. 19 and 20, the molding state of the optical element 105 is enlarged to FIG. Show. That is, in the conventional one, the surface layer of the resin 107 becomes lower than the secondary transition temperature during the molding of the optical element 105, and the resin 107 is placed on the ridge 110 of the V-shaped cross-sectional groove 109 formed in the mold 108. In some cases, the optical element 105 could not be completely filled, and the portion of the ridge 103 of the obtained optical element 105 became a curved surface 111 in some cases. As described above, in the optical component 101 having the optical element 105 in which the ridge 103 is a curved surface 111, the light beam incident on the ridge 103 of the optical element 105 passes through the optical element 105 as it is and the pupil of the observer is observed. As shown in FIG. 7, which schematically shows the state of the field of view 106, the ridge line 103 of the index 102 is transparent, and the contour of the index 102 is blurred due to the diffraction phenomenon. In particular, in various types of single-lens reflex cameras incorporating a line-of-sight input type automatic focusing mechanism, only a distance measurement mark corresponding to the photographer's line of sight functions as a display of a superimposed display that is lit by an LED or the like. Such blurring of the outline of the indicator 102 in the information display display not only lowers the visibility of information but also means that unnecessary light enters the pupil of the photographer.
[0008]
In order to improve the transferability of the resin 107 to the mold 108 and completely fill the ridge 110 of the groove 109 having the V-shaped cross section with the resin 107, the filling speed of the resin 107 is increased while the temperature of the mold 108 is increased. Need to be raised. The reason is that when such an optical component 101 is filled into the cavity of the mold 108 at high speed, a weld or a flow mark is generated, and the quality of the optical component 101 cannot be maintained. This is because the temperature of the mold 108 needs to be set higher than the secondary transition temperature of the resin 107 in order to prevent the occurrence of flow marks. However, if the temperature of the mold 108 is set to be higher than the secondary transition temperature of the resin 107, there is a serious problem that the molding cycle becomes longer in order to maintain the heating temperature.
[0009]
Further, when the groove 109 having a V-shaped cross section is formed into a mold 108 by a punch, a portion serving as an image forming surface around the groove 109 having a V-shaped cross section or a portion close to an image forming position rises and cracks or “ The burrs 112 (see FIG. 22) occur, and when such cracks or the burrs 112 are transferred to the optical component 101, a problem occurs that the outline of the index 102 becomes unclear. Moreover, even if the punch is pressed against the molding surface 113 of the mold 108, since the mold itself is elastically deformed, it is difficult to accurately transfer the shape formed on the punch to the mold. It is basically difficult to form 105 on a portion to be an image forming surface of optical component 101 or a portion close to an image forming position.
[0010]
Further, in the method disclosed in Japanese Patent Application Laid-Open No. 2001-162429, in which the forming surface 113 of the mold 108 is turned using a rotary tool having a pyramid-shaped diamond tip, the usable mold material is copper-based. It is limited to alloys, KN, and the like, and it is not possible to use a crystalline nickel electroformed mold having a hardness of Hv550 or more.
[0011]
[Object of the invention]
An object of the present invention is to provide an optical component and a method for manufacturing a mold for molding the optical component.
[0012]
It is another object of the present invention to provide a camera incorporating such an optical component and a mold manufactured by the method of the present invention.
[0013]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided an optical component which is disposed at an image forming position of an optical image forming apparatus or which is disposed in close proximity to the image forming position, Alternatively, an optical element having at least a pair of opposed slopes is formed in a portion close to the image forming position, and this optical element is a portion to be the image forming surface or a portion close to the image forming position. It is characterized by being formed in a depressed state.
[0014]
According to a second aspect of the present invention, there is provided a camera incorporating the optical component according to the first aspect of the present invention.
[0015]
A third aspect of the present invention is directed to an optical system having an optical element disposed at or near an imaging position of an optical imaging device and having at least a pair of opposed slopes. A method of manufacturing a mold for molding a component, comprising applying a reactive curing resin to a surface of a base plate having a shape corresponding to a portion of an optical surface on which the optical element of the optical component is formed. Curing the reactive cured resin from the base plate, and engraving a groove corresponding to the optical element on a transfer surface of the reactive cured resin to form a replica master. Performing electroforming on the transfer surface of the replica master to form a mold material; removing the replica master from the electroformed mold material; and The mold material over has been removed and is characterized in that comprising the step of machining a mold.
[0016]
A fourth aspect of the present invention resides in a mold manufactured by the manufacturing method according to the third aspect of the present invention.
[0017]
According to the present invention, a state in which an optical element formed on a portion to be an imaging surface or a portion near an imaging position is depressed with respect to a portion to be an imaging surface or a portion near an imaging position When molding this optical component with resin or the like, the molding surface of the cavity of the mold corresponding to the optical element is securely filled with resin, etc. Alternatively, an optical element as designed with good visibility is surely formed in a portion close to the imaging position.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
In the optical component according to the first aspect of the present invention, the optical component may be a prism block or a reticle of a single-lens reflex camera.
[0019]
The optical element may constitute an selectively illuminable information display display or a frame-shaped indicator. In this case, the frame-shaped index may be a distance measurement mark indicating a focusing area in the automatic focusing mechanism or a photometry mark indicating a photometry area by an exposure meter.
[0020]
The method for manufacturing a mold according to the third aspect of the present invention may further include a step of forming a fine uneven pattern on the base plate, and the reactive curable resin may be applied so as to cover the uneven pattern. .
[0021]
It is preferable that the optical element is formed so as to be depressed with respect to a portion to be an image forming surface of the optical component or a portion close to an image forming position.
[0022]
The reactive curable resin may be an ultraviolet curable resin.
[0023]
【Example】
An embodiment in which the optical component according to the present invention is applied as a roof prism incorporated in a real image type viewfinder optical system of a small camera with a lens shutter will be described in detail with reference to FIGS. 1 to 4. Not only by way of example, but also all changes and modifications encompassed by the inventive concept described in the claims of this specification are possible, and therefore naturally applicable to other technologies belonging to the spirit of the present invention. can do.
[0024]
FIG. 1 shows a schematic structure of a real image type finder optical system in this embodiment, FIG. 2 shows an appearance of the roof prism, and FIG. 3 shows a cross-sectional shape of a portion near an image forming position. That is, a first prism 13a and a second prism 13b are provided between an objective lens unit 11 having three groups and three lenses each including a plano-convex lens 11a, a bi-concave lens 11b, and a bi-convex lens And a reflecting mirror 14 for guiding an optical path from the erecting prism unit 13 to the eyepiece 12 side. A field frame 15 is interposed at an image forming position of the objective lens unit 11 set between the reflective mirror 13b and the reflecting mirror 14. Exit surface 16 of roof prism 13b formed by a convex spherical surface _o Are arranged in the vicinity of the image forming position of the objective lens unit 11, that is, the portion of the field frame 15.
[0025]
The number of reflections by the erecting prism unit 13 is set in consideration of the reflection by the reflecting mirror 14 so that an erect erect image can be observed when the field of view is viewed from the eyepiece lens 12. Face 16 _r The light reflected by the _i Exit surface 16 _o Is projected to the reflecting mirror 14 side, and the photographer observes the image formed by the objective lens unit 11 and surrounded by the field frame 15 by enlarging it with the eyepiece 12.
[0026]
The exit surface 16 of the roof prism 13b close to the imaging position _o Is formed with an index 17 such as a distance measurement mark. Each of these indices 17 is formed by a groove having a V-shaped cross section, and functions as an optical element having a pair of opposed slopes 17a. Incident surface 16 of roof prism 13b _i From the roof surface 16 _r At the entrance surface 16 again. _i After total reflection at the exit surface 16 _o Emitted from At this time, the light passing through the portion of the index 17 is almost totally reflected by the slope 17 a of the index 17, and _o The light deviates in a different direction from the light emitted from the camera and does not reach the pupil of the photographer. Thereby, the index 17 can be clearly observed in black. That is, the exit surface 16 of the roof prism 13b _o Of the light passing through the light incident on the inclined surface 17a of the optical element, is totally reflected by the inclined surface _o Greatly deviates in the horizontal direction intersecting the optical axis C of For this reason, the photographer can visually recognize the dark line corresponding to the index 17 such as a distance measurement mark (see FIG. 19). Thus, the exit surface 16 of the roof prism 13b close to the image forming position _o The index 17 formed on the exit surface 16 _o Even if it is depressed, there is no significant difference with respect to the basic optical performance from a conventional index that protrudes to the surroundings.
[0027]
FIG. 4 shows a state in which such an optical element portion is being molded by a corresponding mold. That is, the convex portion 17 ′ having a mountain-shaped cross-sectional shape obtained by inverting the optical element of the roof prism 13 b is formed on the molding surface 16 of the mold 18. _o ′, The resin in the molten state easily wraps around the convex portion 17 ′ and the molding surface 16 of the mold 18. _o 'It is possible to transfer the resin accurately.
[0028]
Thus, the molding surface 16 _o In order to manufacture a mold 18 having a 'convex portion 17' on the exit surface 16 of the roof prism 13b, _o After making a replica master of the same shape as above and performing electroforming using nickel, nickel alloy or copper-based material to transfer the injection surface formed on this replica master, remove the replica master from the electroformed block The electroformed block may be cut out as a mold (forming piece). In the case of manufacturing the above-mentioned replica master, the surface of the material to be the replica master is subjected to KN plating (electroless nickel plating) or the like, and for example, a rotary cutting tool disclosed in JP-A-2001-162429 is used. A corresponding V-shaped groove is cut in the surface of the material to be the replica master. A mold manufactured from the above-described electroformed block is formed by using a molded product formed by using the mold, for example, the shrinkage that occurs when the roof prism 13b is formed. _o It is effective to work with the shape of 'corrected.
[0029]
In the above-described embodiment, the exit surface 16 close to the imaging position of the roof prism 13b as an optical component is used. _o Although the index 17 such as a ranging zone is formed on the focusing lens, a focusing plate of a single-lens reflex camera can be used as an optical component. Is also effective.
[0030]
FIG. 5 shows the appearance of another embodiment of the optical component according to the present invention. In other words, a part of the focusing screen 19 where a plurality of (seven in the illustrated example) distance measuring zones are formed as the indices 17 and serves as an image forming surface is a mat surface 19a, and an image including such a mat surface 19a is formed. An example of a procedure for manufacturing a forming piece for forming an image plane will be described below step by step with reference to FIGS. First, a photographic dry plate 20 is prepared by coating a gelatin-based photoreceptor 20b on a glass substrate 20a (see FIG. 6). The photographic dry plate 20 is irradiated with laser diffused light to perform development and fixing processing, and a fine density pattern corresponding to the intensity distribution of the laser diffused light, that is, a fine uneven pattern 21 due to a change in the thickness of the photosensitive material 19b, specifically Is formed on the glass substrate 20a with sinusoidal irregularities and speckle pattern irregularities. This photographic dry plate 20 is attached to a previously prepared iron substrate 22 (see FIG. 7) so that the fine uneven pattern 21 of the glass substrate 20a is exposed on the surface (see FIG. 7), so that the photosensitive material surface has conductivity. Then, nickel 23 having a thickness of about 12 mm is deposited on the surface of the iron substrate 22 by electroforming so as to cover the photographic dry plate 20 (see FIG. 8). Thereafter, the photographic dry plate 20 and the iron substrate 22 are released from the formed nickel electroformed body 23 (see FIG. 9). The obtained nickel electroformed body 23 has a transfer surface 21 ′ on which the fine uneven pattern 21 of the photosensitive material 19 b is transferred, that is, the same mat surface as the mat surface 19 a of the reticle 19. The cast body 23 is processed as a sub replica master 24 having a predetermined dimension (see FIG. 10).
[0031]
The sub-replica master 24 is mounted on the mold 25 so that the transfer surface 21 'of the sub-replica master 24 thus manufactured faces upward (see FIG. 11). A predetermined amount, for example, 0.3 ml of a UV curable resin 26a as a reactive curable resin according to the present invention, for example, GRANDICRC8922 (trade name) manufactured by Dainippon Ink and Chemicals Co., Ltd. 0.5mW / cm after defoaming ² Irradiate with UV light for 10 minutes and further increase the output to 16 mW / cm ² And irradiated for 3 minutes to completely cure the ultraviolet curable resin 26a (see FIG. 12). Further, a predetermined amount of, for example, 0.2 ml of the uncured UV-curable resin 26b is poured onto the cured UV-curable resin 26a, and the glass substrate 27 that has been previously subjected to silane treatment with a silane-based coupling agent is applied. The glass substrate 27 is placed on the mold 25 face down, and the glass substrate 27 is brought into close contact with the surface of the uncured ultraviolet curable resin 26b. Then, 0.5 mW / cm again from above the glass substrate 27. ² Irradiation of UV light for 20 minutes, and further output of 16 mW / cm ² Then, by irradiating for 3 minutes, the uncured UV-curable resin 26b is completely cured and integrated with the previously cured UV-curable resin 26a (see FIG. 13). Thereafter, the glass substrate 27 bonded to the UV-curable resin 26 integrated by curing is pulled up above the mold 25, and the UV-curable resin 26 is separated from the sub-replica master 24 together with the glass substrate 27. Type. Thus, the fine uneven pattern 21 corresponding to the fine uneven pattern 21 of the photosensitive material 19b formed on the original glass substrate 20a is transferred to the surface of the ultraviolet curable resin 26 (FIG. 14). reference).
[0032]
After a groove having a V-shaped cross section corresponding to the index 17 is formed on the surface of the ultraviolet curable resin 26 thus obtained by a rotary cutting tool (see FIG. 15), the surface is made conductive. Gold is deposited, and nickel 28 is deposited by electroforming so as to cover the ultraviolet curing resin 26 (see FIG. 16). Thereafter, the ultraviolet curable resin 26 is released together with the glass substrate 27 from the formed nickel electroformed body 28 (see FIG. 17). The obtained nickel electroformed body 28 has a transfer surface on which the fine concavo-convex pattern 21 of the photosensitive material on the surface of the ultraviolet curable resin 26 and the convex portion 17 ′ of the chevron-shaped cross section obtained by inverting the index 17 are transferred. The nickel electroformed body 28 is processed into a forming piece 29 having a predetermined size (see FIG. 18).
[0033]
The molding piece 29 obtained in this manner does not show any swelling of the molding surface around the convex portion 17 'of the chevron-shaped cross-section in which the index 17 is inverted, that is, the swelling of the transfer surface 21'. As a result, it was confirmed that high transferability was obtained also in the result of injection molding of the reticle 19. Further, when this focusing screen 19 was incorporated into a single-lens reflex camera and the state of the visual field was checked, no abnormality was seen around the index 17 and clear recognition was possible.
[0034]
In the above-described embodiment, the molding pieces 29 can be relatively easily and repeatedly produced using the ultraviolet curable resin 26. However, when such a need is not required, the sub replica master 24 shown in FIG. After forming a V-shaped groove serving as the index 17 on the transfer surface 21 ′ by using a rotary cutting tool, the forming piece 29 can be manufactured by performing the steps shown in FIG. 16 and subsequent steps. In this case, the transfer step using the ultraviolet curable resin 26 shown in FIGS. 11 to 14 is not required, so that the number of manufacturing steps can be omitted. The exit surface 16 of the roof prism 13b shown in FIG. _o In the case of an optical component having a flat optical surface as in the above, the sub replica master 24 can be finished by machining without performing the electroforming process by omitting the steps shown in FIGS. .
[0035]
In addition, among various single-lens reflex cameras incorporating a line-of-sight input type automatic focusing mechanism, there is also known one in which only a distance measurement mark corresponding to a photographer's line of sight is turned on by an LED or the like. Needless to say, the present invention can be applied to an information display display in which photographing information such as a shutter speed and an aperture value is displayed in a viewfinder in addition to such an information display display.
[0036]
【The invention's effect】
According to the optical component of the present invention, the optical element formed on the part to be the image plane or the part near the image position is the part to be the image plane or the part near the image position. When this optical component is molded with resin or the like, the cavity of the mold as an optical element can be reliably filled with resin or the like. It is possible to reliably form an optical element as designed with good visibility on a portion to be an image plane or a portion near an image forming position.
[0037]
When the optical component is a prism block or a reticle of a single-lens reflex camera, the present invention is applied as an optical component having an optical element with good visibility which constitutes a part of a finder optical system of an optical device such as a camera. Can be.
[0038]
When the optical element constitutes an information display that can be selectively illuminated, the information display can have good visibility.
[0039]
When the optical element forms a frame-shaped index, this index can be used as a distance measurement mark indicating a focusing area in the automatic focusing mechanism or a photometry mark indicating a photometry area by an exposure meter.
[0040]
According to the camera of the present invention, the optical element formed on the portion to be the image forming surface of the optical component or the portion near the image forming position is the portion to be the image forming surface or the portion near the image forming position. Since the optical component is formed in a recessed state, when molding the optical component with resin or the like, it is possible to reliably fill the cavity of the mold as an optical element with resin or the like. It is possible to reliably form an optical element as designed with good visibility on a portion to be an image plane or a portion near an image forming position.
[0041]
According to the method of manufacturing a mold of the present invention, a reactive curable resin is applied to the surface of a base plate having a shape corresponding to a portion of an optical surface on which an optical element of an optical component is formed, and this is cured and cured. The reactive cured resin is released from the base plate, a groove corresponding to the optical element is engraved on the transfer surface of the reactive cured resin to form a replica master, and the transfer surface of the replica master is electroformed to form a metal. After forming the mold material, the replica master was removed from this mold material and the mold material was machined as a mold, so it was formed on the part to be the image plane or the part close to the image position To easily, efficiently, and inexpensively manufacture a mold for manufacturing an optical component that is formed in a state where an optical element to be formed becomes a concave portion with respect to a portion serving as an image forming surface or a portion close to an image forming position. Can be.
[0042]
When a minute uneven pattern is formed on the base plate and a reactive curable resin is applied so as to cover the uneven pattern, an optical component having a matte surface at a portion serving as an image forming surface can be formed.
[0043]
In the case where the optical element is formed so as to be depressed with respect to a portion to be an image forming surface or a portion close to an image forming position, a resin or the like is surely filled in a cavity of a mold to be an optical element. Thus, an optical element having good visibility and designed as designed can be reliably formed on a portion to be an image forming surface of an optical component or a portion near an image forming position.
[0044]
According to the mold of the present invention, a reactive hardening resin is applied to the surface of a base plate having a shape corresponding to a portion of an optical surface on which an optical element of an optical component is formed, and the hardening is performed. The resin is released from the base plate, a groove corresponding to the optical element is engraved on the transfer surface of the reactive cured resin, a replica master is formed, and the transfer surface of the replica master is electroformed to form a mold material. After forming the replica master from this mold material and removing the replica master from the mold material, the mold material is machined as a mold. It is possible to manufacture an optical component which is molded in a concave state with respect to a portion where an element is an image plane or a portion close to an image position.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram illustrating an embodiment of a real image type finder optical system as an example of an optical imaging device according to the present invention.
FIG. 2 is a perspective view illustrating an appearance of a roof prism constituting a part of the real image type viewfinder optical system illustrated in FIG.
FIG. 3 is an enlarged cross-sectional view of a portion near an imaging position of a roof prism shown in FIG. 2;
4 is a cross-sectional view illustrating a molding state of a portion of the optical element illustrated in FIG.
FIG. 5 is a perspective view showing an appearance of an embodiment in which the optical component according to the present invention is applied to a reticle of a single-lens reflex camera.
6 is a process diagram showing a manufacturing procedure of a molding piece for molding the reticle shown in FIG. 5 together with FIGS. 7 to 18, and shows a side shape of a photographic dry plate.
7 is a process diagram showing a manufacturing procedure of a molding piece for forming the reticle shown in FIG. 5 together with FIG. 6 and FIGS. 8 to 18 and shows a state in which minute irregularities are formed on the surface of the photosensitive material.
8 is a process chart showing a manufacturing procedure of a molding piece for forming the focusing screen shown in FIG. 5, together with FIGS. 6, 7, and 9 to 18, and shows a state in which nickel is electroformed.
FIG. 9 is a process diagram showing a manufacturing procedure of a molding piece for forming the focusing screen shown in FIG. 5 together with FIGS. 6 to 8 and FIGS. 10 to 18, and schematically shows the shape of a nickel electroformed body.
FIG. 10 is a process diagram showing a manufacturing procedure of a molding piece for forming the reticle shown in FIG. 5, together with FIGS. 6 to 9 and FIGS. 11 to 18, and shows a side shape of the sub-replica master.
11 is a process diagram showing a procedure for manufacturing a molding piece for forming the reticle shown in FIG. 5 together with FIGS. 6 to 10 and FIGS. 12 to 18, showing a state where the sub-replica master is mounted on the mold. .
12 is a process diagram showing a manufacturing procedure of a molding piece for forming the reticle shown in FIG. 5 together with FIGS. 6 to 11 and FIGS. 13 to 18, and shows a state in which an ultraviolet curable resin is poured.
13 is a process diagram showing a manufacturing procedure of a molding piece for forming the reticle shown in FIG. 5 together with FIGS. 6 to 12 and FIGS. 14 to 18, showing a state in which a glass substrate is overlaid on a mold; Show.
14 is a process diagram showing a manufacturing procedure of a molding piece for forming the reticle shown in FIG. 5 together with FIGS. 6 to 13 and FIGS. 15 to 18, and shows a side surface of the ultraviolet curing resin bonded to the glass substrate. Show the shape.
FIG. 15 is a process chart showing a manufacturing procedure of a molding piece for forming the focusing screen shown in FIG. 5 together with FIGS. 6 to 14 and FIGS. 2 shows a state in which a groove having a cross section is formed.
FIG. 16 is a process diagram showing a manufacturing procedure of a molding piece for forming the reticle shown in FIG. 5 together with FIGS. 6 to 15, 17 and 18, and shows a state in which nickel is electroformed.
FIG. 17 is a process chart showing a manufacturing procedure of a molding piece for forming the focusing screen shown in FIG. 5 together with FIGS. 6 to 16 and FIG. 18, and schematically shows a shape of a nickel electroformed body.
18 is a process chart showing a manufacturing procedure of a molding piece for forming the reticle shown in FIG. 5 together with FIGS. 6 to 17, and shows a side shape of the completed molding piece.
FIG. 19 is a conceptual diagram schematically illustrating an example of a visual field in an optical imaging device.
20 is a sectional view taken along the line XX-XX in FIG.
FIG. 21 is a conceptual conceptual diagram of an optical path passing through the optical element shown in FIG. 20;
FIG. 22 is a cross-sectional view illustrating an example of a conventional molding state of the optical element illustrated in FIG.
FIG. 23 is a conceptual diagram showing a state of a conventional visual field in an optical imaging device.
[Explanation of symbols]
11 Objective lens unit
11a Plano-convex lens
11b biconcave lens
11c biconvex lens
12 Eyepiece
13 Upright prism unit
13a First prism
13b 2nd prism (Dach prism)
14 Reflector
15 Field of view frame
16 _o Exit surface
16 _r Dach side
16 _i Incident surface
16 _o '' Molding surface
17 indicators
17a Slope
17 'convex
18 Mold
19 Focusing screen
19a Matt surface
19b Photoconductor (sensitive material)
20 photographic plates
20a glass substrate
20b photoreceptor
21 Micro uneven pattern
21 'transfer surface
22 Iron substrate
23 Nickel (electroformed nickel)
24 Sub Replica Master
25 Formwork
26, 26a, 26b UV curable resin
27 Glass substrate
28 Nickel (electroformed nickel)
29 Molding piece
C optical axis
L ray

Claims (12)

An optical component disposed at an imaging position of the optical imaging device or disposed in close proximity to the imaging position,
An optical element having at least a pair of opposed slopes is formed on a portion to be an image forming surface or a portion near the image forming position, and the optical element is a portion to be the image forming surface or the image forming portion. An optical component, wherein the optical component is formed so as to be depressed with respect to a portion close to a position. The optical component according to claim 1, wherein the optical component is a prism block. The optical component according to claim 1, wherein the optical component is a reticle of a single-lens reflex camera. The optical component according to any one of claims 1 to 3, wherein the optical element forms an information display that can be selectively illuminated. The optical component according to claim 1, wherein the optical element forms a frame-shaped index. 6. The optical component according to claim 5, wherein the index is a distance measurement mark indicating a focus area in the automatic focusing mechanism. The optical component according to claim 5, wherein the index is a photometric mark indicating a photometric area by an exposure meter. A camera incorporating the optical component according to claim 1. A mold for molding an optical component having an optical element having at least a pair of opposing slopes disposed at or close to an imaging position of an optical imaging device. A manufacturing method,
Applying a reactive curable resin to the surface of a base plate having a shape corresponding to the portion of the optical surface on which the optical element of the optical component is formed, and curing the same;
Releasing the cured reactive cured resin from the base plate,
Engraving a groove corresponding to the optical element on the transfer surface of the reactive cured resin to form a replica master,
Performing electroforming on the transfer surface of the replica master to form a mold material,
Removing the replica master from the electroformed mold material;
Machining the mold material from which the replica master has been removed as a mold,
A method for manufacturing a mold, comprising: The method according to claim 9, further comprising forming a fine concavo-convex pattern on the base plate, wherein the reactive curable resin is applied so as to cover the concavo-convex pattern. The mold according to claim 9, wherein the optical element is formed so as to be depressed with respect to a portion serving as an image forming surface or a portion close to the image forming position. Method. A mold manufactured by the method according to claim 9.

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