JP2005037493A - Display device for optical apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical apparatus with a display device which enhances visibility of a focal point detection frame displayed in a finder. <P>SOLUTION: A focal point detection frame 12g is separated into a line A at an end and lines B other than the end one. A prism 12-1g forms the lines B other than the end line. A prism 120-2g forms a line A at the end. The prisms 12-1g and 12-2g are arranged in a ridge direction 12gA in which their ridges are inclined to a horizontal direction. They are also arranged so as to almost perpendicular to an incident light L7' from an illuminating means. The length L1g of the prism 12-1g is shorter than the length L2g of the prism 12-2g. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical device such as a camera, a video camera, and binoculars, and relates to a display device for an optical device that performs so-called superimpose display that illuminates and displays a selected index such as a focus detection frame on a finder. It is.
[0002]
[Prior art]
In general, an optical device that performs superimpose display includes, for example, an imaging optical system for forming a subject image on a focusing screen, and a finder optical for enabling observation of the subject image via a pentaprism. System.
The focusing screen is disposed in the vicinity of a position equivalent to the planned image formation plane of the subject image, and includes a reflecting plate on which a display unit is formed, a condenser lens, and the like, and desired illumination means (for example, a lens mold type LED). By using this to illuminate the display unit, the reflected light from the display unit can be observed with the viewfinder together with the subject image.
[0003]
The display unit is formed with a focus detection frame configured by arranging a plurality of microprisms. The visibility of the display unit is improved by the reflected light from the display unit reaching the observer's eye point, so that the incident angle of the incident light by the illumination unit with respect to the direction of the ridge line of the prism (tangent line between the slopes of the prism) Is an important factor.
[0004]
As a display device of a conventional optical device in consideration of the incident angle of incident light to the prism, for example, there is one in which the prisms are arranged so that the incident light from the illumination unit is substantially orthogonal to the direction of the ridge line of the prism. The reflected light from the display unit reaches the observer's eye point, and the observer can visually recognize all the focus detection frames without shaking the line of sight (for example, Patent Documents). 1).
[0005]
[Patent Document 1]
JP 2000-122156 A
[0006]
[Problems to be solved by the invention]
However, the above-described display device for an optical device has the following problems.
FIG. 10 is a partially enlarged view of a conventional focus detection frame. For convenience of explanation, the design size (design dimension) of the focus detection frame is indicated by a two-dot chain line.
The focus detection frame 120g is divided into a row A at the end and a row B other than the end. For example, a plurality of prisms are two-dimensionally arranged in the focus detection frame 120g. The plurality of prisms are divided into prisms 120-1g constituting a row B (four rows here) other than the end portions and prisms 120-2g constituting a row A of the end portions.
[0007]
The prisms 120-1g and 120-2g have a slope of 120g. ₁ 120g ₂ And these slopes 120g ₁ 120g ₂ And a ridgeline 120 gA which is a tangent line. The prisms 120-1g and 120-2g are arranged along the direction of the ridgeline 120gA inclined with respect to the horizontal direction so that the ridgeline 120gA is substantially orthogonal to the incident direction L7 ′ of incident light from the illumination unit. ing.
[0008]
The visibility of the focus detection frame 120g formed on the display unit will be described.
(1) Three prisms 120-1g are arranged for each row in order to form a row B other than the end portions, and are larger than the vertical width b which is the design dimension of the focus detection frame 120g. For this reason, a part of the focus detection frame 120g configured by arranging the prisms 120-1g (the outer edge of the row B other than the end portion) is observed in a jagged manner instead of a straight line in the viewfinder, and further, the focus detection frame 120g The vertical width becomes larger than the vertical width b, which is a design dimension, and is observed thick.
This reduction in the visibility of the display unit is particularly noticeable in optical devices with high finder magnification (for example, single-lens reflex cameras), optical devices equipped with magnifiers (magnifying glass), and the like.
(2) In the display unit, not only the focus detection frame 120g but also other focus detection frames are formed at appropriate positions (areas). Therefore, depending on the positional relationship between the illumination means and each area, the ridge line direction of each prism arranged to constitute each focus detection frame varies depending on the area, and the degree of “jaggedness” also changes. The appearance of the detection frame in the finder changes for each position of the area.
[0009]
The subject of this invention is providing the display apparatus of the optical instrument which can improve the visibility of indices, such as a focus detection frame displayed on a finder.
[0010]
[Means for Solving the Problems]
The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this. That is, the invention of claim 1 is arranged near the imaging surface of the imaging optical system and forms a subject image by the imaging optical system, and the imaging on the screen (12). In the display device of an optical apparatus including an index portion (12a to 12i) including a plurality of columnar refracting members (12-1g, 12-2g) arranged two-dimensionally in the vicinity of the surface (12A), the plurality of columnar shapes The refracting members (12-1g, 12-2g) are arranged to be inclined with respect to one direction of the two-dimensional array and are arranged in a plurality of rows (A, B) in the other direction of the two-dimensional array. The columnar refracting members constituting the second columnar refracting member row (B) excluding the first columnar refracting member row (A) existing at the end in the one direction among the plurality of rows (A, B). (12-1g) is the first columnar refractive member row (A). The length of the Jo refracting member (12-2g) (L2g) shorter than a display device of an optical instrument according to claim.
[0011]
A second aspect of the present invention is the display device for an optical instrument according to the first aspect, further comprising illumination means (30) for illuminating the indicator portions (12a to 12i), wherein the direction of inclination (12gA) is the indicator. Is a direction orthogonal to the optical axis (L1 ′ to L7 ′) of the light beam that illuminates the portions (12a to 12i), and the longitudinal direction of the columnar refractive members (12-1g, 12-2g) is the direction of the inclination It is a display device of an optical instrument characterized by being matched with (12 gA).
[0012]
Invention of Claim 3 is the display apparatus of the optical apparatus of Claim 1 or Claim 2, Among the columnar refractive members (12-1g ') which comprise the said 2nd columnar refractive member row | line | column (B), The columnar refracting member (12-1G) disposed at the end in the other direction is shorter than the length (L1g ′, L1g ″) of the other columnar refracting member in the row. Display device.
[0013]
According to a fourth aspect of the present invention, in the display device for an optical apparatus according to any one of the first to third aspects, the screen (12) is an optical member having a refractive power, and the indicator portion. (12a to 12i) are display devices for optical equipment, which are formed integrally with the optical member.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a diagram showing an embodiment of a display device for an optical apparatus according to the present invention. Here, a camera system is shown as an example of an optical apparatus provided with a display device.
The camera system 100 includes a lens barrel (not shown), a camera body 50 to which the lens barrel is attached, and the like. The camera body 50 is, for example, for enabling the finder 7 to observe the subject light L via the camera upper cover 1 that is an external member at the top of the camera and the photographing optical system (imaging optical system) in the lens barrel. A finder optical system 40, a light projecting unit 30, a photometric lens 8, a photometric sensor 9, and a flexible printed circuit board 23 mounted with various electronic circuits are provided.
[0015]
In the finder optical system 40, the subject light L reflected by the movable mirror 3 passes through the focusing screen 11, the field mask 24, the condenser lens 12, the pentaprism 13, and the eyepieces 5 and 6, and the photographer. It is observed with the finder 7 by (observer). When the movable mirror 3 is mirrored and is at a photographing position (mirror up position) (not shown), the subject light L reaches the film 2 and exposes the film 2.
[0016]
The focusing screen 11 has a Fresnel surface 11a and a focus surface (mat surface) 11b. The condenser lens 12 has a lower surface 12A and an upper surface 12B. The focusing screen 11, the condenser lens 12, and the pentaprism 13 are supported by the camera body 50.
[0017]
The photometric lens 8 and the photometric sensor 9 are for measuring the subject brightness, and are arranged at the rear of the pentaprism 13 and in the vicinity of the eyepieces 5 and 6. The flexible printed circuit board 23 is disposed so as to cover the outer periphery of the pentaprism 13.
[0018]
The field mask 24 is disposed on the lower surface 12A of the condenser lens 12, for example, and limits the range that can be observed by the finder 7. The field mask 24 is disposed on the focus surface 11b in order to eliminate parallax when the observer shakes his / her line of sight.
[0019]
The condenser lens 12 is a lens for correcting distortion and condensing the diffused light from the focusing surface 11b of the focusing screen 11 on the eye point of the observer. For example, the subject light L is observed by the finder 7. When displayed, a bright display without distortion can be performed. On the lower surface 12A of the condenser lens 12, a display unit (having an index composed of a prism) is integrally formed. For example, focus detection frames 12a to 12i described later are formed at appropriate positions.
[0020]
The light projecting unit 30 is, for example, disposed at the front portion of the pentaprism 13 and supported by a holder 22, a chip-type light emitting diode (hereinafter referred to as an LED) 16 fixed to the hard substrate 15, One light shielding member 17, a lens array 18, a second light shielding member 19, a diffusion plate 20, a diaphragm mask 21, a prism 14 and the like are provided. The light projecting unit 30 is a light projecting element for performing so-called superimpose display in which an index such as the focus detection frames 12a to 12i selected by the observer is superimposed on the subject light L and observed simultaneously with the finder 7. .
[0021]
Next, advantages of integrally forming the display unit on the condenser lens 12 included in the finder optical system 40 will be described.
In order to perform display on the finder 7 of the camera system 100, it is necessary to form a display unit on any of the optical members included in the finder optical system 40. When the display portion is formed on the focusing screen 11, flare may occur due to the influence of the focus surface 11b and the Fresnel surface 11a.
[0022]
In some cases, a reflective plate is disposed between the focusing screen 11 and the condenser lens 12 to form a display unit on the reflective plate. However, in this case, the number of parts increases, the cost increases, and when dust or the like adheres between the condenser lens 12 and the reflecting plate, it is necessary to disassemble each part and remove the dust or the like ( For example, dust attached to the replaceable focusing screen 11 can be easily removed by an observer or the like, but dust attached to the reflector cannot be removed easily).
[0023]
For this reason, an observer etc. will ask a service center etc. to clean a reflecting plate. Further, even when the reflector is detachable, the field mask 24 must be disposed on the reflector, so that the distance from the focus surface 11b increases, and the observer shakes his / her line of sight. Parallax is likely to occur.
[0024]
In the camera system 100 according to the present embodiment, as described above, the display unit is formed integrally with the condenser lens 12.
The condenser lens 12 is formed of, for example, a resin, the distortion must be reduced to increase the resolution, the quality must be maintained even in a high-temperature and high-humidity environment, and a plurality of microprisms on the display unit. This takes into account the need to form (described later) with high surface accuracy. According to the condenser lens 12, it is possible to reduce the weight as compared with the glass lens, and it is possible to reduce the number of steps for processing parts and reduce the cost.
[0025]
FIG. 2 is a perspective view showing the light projecting unit 30.
FIG. 3 is a cross-sectional view illustrating the light source unit of the light projecting unit 30.
The light projecting unit 30 includes a light projecting holder 22, a light projecting prism 14, a pentaprism 13, and the like, and makes the LED light L <b> 1 to L <b> 9 of the LED 16, which is a light source, incident on a display unit formed integrally with the condenser lens 12. To do.
The LED 16 includes, for example, LEDs 16a to 16i so as to correspond to the focus detection frames 12a to 12i formed on the lower surface 12A of the condenser lens. The LEDs 16a to 16i are soldered to lands (not shown) of the hard substrate 15. It is attached and arranged.
[0026]
The lens array 18 includes a hemispherical lens 18a corresponding to the LEDs 16a to 16i. ₂ ~ 18i ₂ Is provided. Lens 18a ₂ ~ 18i ₂ Can condense the LED light L1 to L9 to compensate for a decrease in luminance as compared with the lens mold type LED, and can create a surface light source in combination with the aperture mask 21.
[0027]
Specifically, the LED lights L1 to L9 are light guide paths 18a of the lens array 18 arranged corresponding to the LEDs 16a to 16i. ₁ ~ 18i ₁ More incident, the lens 18a ₂ ~ 18i ₂ After being condensed and emitted, the surface light source is formed by passing through the diffusion plate 19 and the diaphragm mask 20. Further, a light guide path 18 a provided in the lens array 18. ₁ ~ 18i ₁ Can prevent display interference (crosstalk) and ghost from being visually recognized by the finder 7.
[0028]
The LED 16 is a chip type and has a small directivity and a wide range of projection. For this reason, a first light shielding member 17 is disposed between the hard substrate 15 and the lens array 18, and a second light shielding member 19 is disposed between the lens array 18 and the diffusion plate 20. In addition, as a material of the 1st light shielding member 17 and the 2nd light shielding member 19, what has elasticity, such as rubber | gum, in order to improve adhesiveness is desirable.
[0029]
The light projection prism 14 includes lenses 14a to 14c, reflection surfaces 14d to 14f, reflection surfaces 14g to 14i, and lenses 14j to 14l, and the LED lights L1 to L9 are incident from the lenses 14a to 14c. The light is totally reflected by the reflecting surfaces 14d to 14f, further reflected by the reflecting surfaces 14g to 14i, and projected onto the condenser lens 12 by the front lenses 14j to 14l.
[0030]
The incident surfaces of the light projection prism 14 are lenses 14a, 14b, and 14c. Similarly, the exit surfaces are lenses 14j, 14k, and 14l, and each has a curvature. The light projecting prism 14 includes, for example, three optical blocks (the lenses 14a, 14d, 14g, and 14j are one optical block).
[0031]
The lenses 14a, 14b, and 14c on the entrance surface are approximately the center of the lenses 14j, 14k, and 14l on the exit surface in order to cause the LED lights L1 to L9 projected from the plurality of LEDs 16a to 16i to enter and exit with the three optical blocks. The LED lights L1 to L9 are directed to. The lenses 14j, 14k, and 14l on the exit surface have a projection relationship between the display unit formed integrally with the condenser lens 12 and the aperture mask 21.
[0032]
The reflective surfaces 14g to 14i are not totally reflective surfaces, but increase the reflectance by evaporating the range of the surfaces that reflect the LED lights L1 to L9. The reflection surfaces 14e and 14f and the reflection surfaces 14h and 14i are changed in angle with the reflection surfaces 14d and 14g according to the positions of the focus detection frames 12a to 12i to be irradiated.
[0033]
Here, the upper surface (here, triangular shape) 13a of the pentaprism 13 is generally a non-reflective surface by being painted black or formed into a rough surface. In the embodiment, the upper surface (here, trapezoidal shape) 13b is a mirror surface in order to secure the incident surface of the LED lights L1 to L9. Therefore, the LED lights L <b> 1 to L <b> 9 emitted from the light projecting prism 14 enter the pentaprism 13 from the upper surface 13 b of the pentaprism 13.
[0034]
FIG. 4 is a diagram showing LED light incident on the pentaprism 13. Here, the optical paths of the LED lights L1, L4, and L7 are shown as an example.
FIG. 5 is a diagram illustrating the lower surface 12A on which the focus detection frames 12a to 12i are formed.
The LED lights L1, L4, and L7 incident on the pentaprism 13 are corrected for distortion by the condenser lens 12, and are incident on the focus detection frames 12a, 12d, and 12g formed on the lower surface 12A of the condenser lens 12. ', L4', and L7 'are respectively incident. The focus detection frames 12a, 12d, and 12g are aggregates of a large number of fine prisms, and the prisms are respectively inclined surfaces 12a. ₁ , 12a ₂ And 12d ₁ , 12d ₂ And 12g ₁ , 12g ₂ And have.
[0035]
Incident lights L1 ′, L4 ′, and L7 ′ to the focus detection frames 12a, 12d, and 12g are prism inclined surfaces 12a arranged in the focus detection frames 12a, 12d, and 12g. ₁ , 12d ₁ , 12g ₁ In total reflection, and further, slope 12a ₁ , 12d ₁ , 12g ₁ Slope 12a facing ₂ , 12d ₂ , 12g ₂ And totally incident on the pentaprism 13.
[0036]
The condenser lens 12 is transparent except for the prisms forming the focus detection frames 12a to 12i. For this reason, the light beam that has not entered the prisms forming the focus detection frames 12a to 12i passes through the focusing screen 11 toward the movable mirror 3 and is not visually recognized by the finder 7.
[0037]
The cross-sectional shape of each prism is a micro triangle, and the light beam incident from a photographing lens (not shown) is refracted by each prism and deviates from the direction of the eyepieces 5 and 6. For this reason, the focus detection frames 12a to 12i are visually recognized darker (for example, black) by the finder 7 than the surroundings. Therefore, only the selected focus detection frames 12a to 12i among the focus detection frames 12a to 12i that are normally viewed as black can be displayed on the finder 7 according to the color (for example, red) of the LED lights L1 to L9. it can.
[0038]
Each of the prisms forming the focus detection frames 12a to 12i passes through the pentaprism 13 and the eyepieces 5 and 6 with respect to the incident light L1 ′ to L9 ′ so that the reflected light reaches the observer's eye point. The ridge lines of the prisms are arranged so as to be substantially orthogonal.
[0039]
FIG. 6 is a partially enlarged view of the central focus detection frame 12a.
The focus detection frame 12a is formed of a plurality of minute prisms 12-1a and 12-2a that are two-dimensionally arranged. The prisms 12-1a and 12-2a are inclined surfaces 12a. ₁ , 12a ₂ And these slopes 12a ₁ , 12a ₂ And a ridge line 12aA which is a tangent line. The prism 12-1a has a length L1a, and the prism 12-2a has a length L2a. In the focus detection frame 12a, as illustrated, the ridgeline 12aA of the prisms 12-1a and 12-2a is substantially parallel to the horizontal direction, and therefore the prisms 12-1a and 12-2a are substantially orthogonal to the incident light L1 ′. As a result, the prisms 12-1a and 12-2a can be arranged without gaps.
[0040]
A condenser lens having a display unit is usually injection-molded, and an indenter having the same shape as the prisms 12-1a and 12-2a constituting the display unit is driven into a mold. Here, since all of the prisms 12-1a and 12-2a have the same shape (that is, L1a = L2a), an indenter having the same shape is used, and efficient processing can be performed.
[0041]
FIG. 7 is a partially enlarged view of the focus detection frame 12g shown in FIG. For convenience of explanation, the design size (design dimension) of the focus detection frame 12g is indicated by a two-dot chain line.
The focus detection frame 12g is divided into, for example, a row A at the end and a row B other than the end (here, 6 rows). The focus detection frame 12g is formed by, for example, a plurality of minute prisms 12-1g and 12-2g arranged two-dimensionally. The prism 12-1g constitutes a row B other than the end portions. The prism 12-2g constitutes an end row A.
[0042]
The prism 12-1g is a slope 12g ₁ , 12g ₂ And these slopes 12g ₁ , 12g ₂ And a ridge line 12 gA which is a tangent line. The prisms 12-1g and 12-2g are arranged along the direction of the ridge line 12gA inclined with respect to the horizontal direction so that the ridge line 12gA is substantially orthogonal to the incident light L7 ′ from the illumination unit. For this reason, the prisms 12-1g and 12-2g are arranged so as to be substantially orthogonal to the incident light L7 ′ from the illumination unit as shown in the figure.
[0043]
The length L1g of the prism 12-1g is shorter than the length L2g of the prism 12-2g. Furthermore, the prism 12-1g is within the design dimensions (vertical width b, horizontal width c).
Similarly to the focus detection frame 12g, the other focus detection frames 12b to 12f, 12h, and 12i are divided into prisms that form the end row A and prisms that form the row B other than the end portions, respectively. The lengths of the prisms in the row A at the end and the row B other than the end are changed, and according to the position on the condenser lens lower surface 12A on which the focus detection frames 12b to 12f, 12h, 12i are formed, The prisms are arranged so that the angles of the ridgelines (not shown) of the prisms and the incident lights L2 ′ to L6 ′, L8 ′, and L9 ′ are substantially orthogonal.
[0044]
When the focus detection frames 12b to 12i are formed on the condenser lens lower surface 12A, the prisms 12-1g constituting the row B other than the end portions (the prisms constituting the row B other than the end portions of the other focus detection frames are not used). Illustrated: hereinafter referred to as 12-1g, etc.) length L1g (others are also not shown: hereinafter referred to as L1g, etc.), prism 12-2g constituting the end row A (ends of other focus detection frames) The indenters corresponding to the length L2g (others not shown: hereinafter referred to as L2g, etc.) of the prism A constituting the row A are driven into the mold, for example, A plurality of triangular prism-shaped recesses are arranged. When the indenter is driven into the mold, when the prisms 12-1g and the like and the prism 12-2g and the like are arranged, the ridgeline 12gA (others are not shown: hereinafter referred to as 12gA etc.) and incident light L2 ′ to L9 ′ Tilt the indenter and drive it into the mold so that and are almost orthogonal to each other.
[0045]
Thus, unlike the case where the focus detection frame is formed only by the prisms of the same length (see FIG. 10), the outer edge of the row B other than the end portion formed by the prisms 12-1g and the like is substantially reduced due to the jaggedness. It becomes linear. Further, the width when the prisms 12-1g and the like are arranged in the vertical direction can be made to substantially match the design dimension (for example, the vertical width b).
[0046]
FIG. 8 is a diagram illustrating focus detection frames 12 a to 12 i displayed on the finder 7.
As described above, the focus detection frames 12b to 12i formed on the condenser lens 12 include the prisms 12-1g and the like that form the rows B other than the end portions, and the prisms 12-2g and the like that form the row A of the end portions. The length L1g etc. of the prism 12-1g etc. is shorter than the length L2g etc. of the prism 12-2g etc. Further, as described above, since the prisms 12-1a and 12-2a can be arranged in the horizontal direction, the central focus detection frame 12a may have the same length.
Therefore, when the outer edges of the focus detection frames 12a to 12i are displayed on the finder 7, the visibility is improved without appearing jagged.
[0047]
According to the present embodiment, (1) in each of the focus detection frames 12b to 12i integrally formed on the condenser lens lower surface 12A, the length L1g and the like of the prisms 12-1g and the like forming the rows B other than the end portions are Since the edge L is shorter than the length L2g of the prism 12-2g etc. forming the row A, the outer edges of the focus detection frames 12b to 12i are observed substantially linearly by the finder 7.
(2) By integrally forming a display unit for superimposing display on the condenser lens 12, a reflector is not required, the number of parts can be reduced and the cost can be reduced. The loss of light quantity due to reflection can be reduced, and the brightness of display on the finder 7 can be improved.
(3) Since it is not necessary to dispose a reflector between the condenser lens 12 and the focusing screen 11, the field mask 24 and the focus surface 11b can be brought close to each other, and parallax can be reduced. Furthermore, it is not necessary to remove dust adhering to the reflector.
(4) By molding the condenser lens 12 with resin, it is possible to reduce the weight, reduce the number of steps for processing parts, and reduce the cost as compared with those made of glass.
[0048]
(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
(1) The lengths L1a, L1g, etc. of the prisms 12-1a, 12-1g, etc. forming the row B other than the ends of the focus detection frames 12a-12i are the same in the same focus detection frames 12a-12i. However, if the outer edges of the focus detection frames 12a to 12i can be observed substantially linearly with the finder 7, the lengths may be different.
[0049]
FIG. 9 is a diagram showing a focus detection frame 12g in which the size of the prism 12-1g is different.
Compared to the prism 12-1g described above, the prism 12-1g ′ forming the row B other than the end of the focus detection frame 12g is not only the length L1g but also approximately twice the length L1g as shown in the figure. And a prism having a length L1g ″ corresponding to substantially three times the length L1g.
In this prism 12-1g ′, for example, among the rows B other than the end portions, at least one prism 12- forming the row B close to the row A at the end and the other row B farthest from the row B. Since the length L1g of 1G is shorter than the lengths L1g ′ and L1g ″ of the other prisms, the degree of freedom in design when arranging the prisms 12-1g ′ in the focus detection frame 12g can be increased. it can.
[0050]
Further, the number of prisms 12-1g ′ forming the rows B other than the end portions can be reduced, and the rows B other than the end portions formed by the prisms 12-1g ′ are within the design dimensions (vertical width b, horizontal width c). Since the occupied area can be increased, the amount of reflected light can be increased and the brightness of display on the finder 7 can be improved.
[0051]
(2) In the focus detection frames 12b to 12i, two types of prisms (prisms 12-1g and the like and prisms 12-2g and the like) having different lengths are used. However, the visibility is not lowered when the prisms are arranged. A plurality of types may be used (the visibility decreases when the number of joints between prisms is large). Thereby, the size of the focus detection frames 12b to 12i can be made closer to the design dimension.
[0052]
(3) Although the prisms 12-1a, 12-1g, etc. and the prisms 12-2a, 12-2g, etc. have the same width, the prisms 12-1a, 12-1g, etc. and the prisms 12-2a, 12-2g, etc. And the width may be different.
[0053]
(4) Although the display unit is formed integrally with the condenser lens 12, for example, when a reflection plate is provided between the condenser lens 12 and the focusing screen 11, the display unit is formed on the reflection plate to detect the focus. The frames 12a to 12i may be formed by the prisms 12-1a and 12-1g and the prisms 12-2a and 12-2g and the like.
[0054]
(5) The light projecting prism 14 includes the optical blocks (three) corresponding to the LED lights L1 to L9, but may include an appropriate number of optical blocks according to the number of LED lights. Good (for example, if there are 15 LED lights, it may be projected with 5 optical blocks).
[0055]
(6) The LED lights L1 to L9 are projected from the upper surface 13b of the pentaprism 13. However, the LED lights L1 to L9 are projected from the movable mirror 3 side and pass through the focusing screen 11 to illuminate the display unit. Also good.
[0056]
【The invention's effect】
As described in detail above, (1) it is arranged in the vicinity of the imaging surface of the imaging optical system, and is two-dimensionally arranged in the vicinity of the imaging surface on the screen that forms the subject image by the imaging optical system. An indicator portion composed of a plurality of columnar refractive members is formed, and the plurality of columnar refractive members are arranged in an inclined manner with respect to one direction of the two-dimensional array and arranged in a plurality of rows in the other direction of the two-dimensional array. The columnar refracting members constituting the second columnar refracting member row excluding the first columnar refracting member row existing at the end in one direction among the plurality of rows are columnar refracting constituting the first columnar refracting member row. Since the length of the member is shorter than the length of the member, the outer edge of the indicator portion is observed in a substantially straight line on the finder, and can be displayed uniformly regardless of the position on the screen, thereby improving the visibility on the finder. .
[0057]
(2) An illuminating means for illuminating the indicator portion is provided, and the direction of inclination is a direction orthogonal to the optical axis of the light beam illuminating the indicator portion, and the longitudinal direction of the columnar refractive member is made coincident with the direction of inclination. Since it did in this way, the reflected light of a parameter | index part can be condensed on an observer's eye point, and the visibility in a finder can be improved.
[0058]
(3) Of the columnar refracting members constituting the second columnar refracting member row, the columnar refracting member disposed at the end in the other direction is shorter than the length of the other columnar refracting members in the row, so the indicator portion The degree of freedom in design can be improved, and the area occupied by the second columnar refractive member row in the indicator portion can be increased. Therefore, the amount of reflected light in the indicator portion can be increased to improve the brightness in the finder. it can.
[0059]
(4) Since the indicator portion is formed integrally with the screen, which is an optical member having a refractive power, parts such as a reflector are not required, the cost can be reduced, and the loss of light quantity due to reflection on the reflector can be reduced. The parallax can also be reduced by bringing the field mask and the focus surface close to each other.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a display device of an optical apparatus according to the present invention.
FIG. 2 is a perspective view showing a light projecting unit 30. FIG.
3 is a cross-sectional view showing a light source part of a light projecting part 30. FIG.
4 is a diagram showing LED light incident on a pentaprism 13. FIG.
FIG. 5 is a diagram showing a lower surface 12A on which focus detection frames 12a to 12i are formed.
FIG. 6 is a partially enlarged view of a central focus detection frame 12a.
7 is a partially enlarged view of a focus detection frame 12g shown in FIG.
8 is a diagram showing focus detection frames 12a to 12i displayed on the finder 7. FIG.
FIG. 9 is a diagram showing a focus detection frame 12g in which the size of the prism 12-1g is made different.
FIG. 10 is a partially enlarged view of a conventional focus detection frame.
[Explanation of symbols]
11 Focusing screen
12 condenser lens
12A Condenser lens bottom surface
12a to 12i focus detection frames
12-1g, 12-2g prism
12gA Ridge direction
13 Penta prism
16a-16i LED
22 Holder
30 Projector
40 Viewfinder optical system
50 camera body
100 camera system
L1-L9 LED light
L1'-L9 'Incident light

Claims (4)

A screen disposed near the image forming surface of the image forming optical system and forming a subject image by the image forming optical system; and a plurality of columnar refractive members arranged two-dimensionally near the image forming surface on the screen. In a display device of an optical device provided with an indicator part,
The plurality of columnar refractive members are arranged to be inclined with respect to one direction of the two-dimensional array, and are arranged in a plurality of rows in the other direction of the two-dimensional array,
The columnar refracting member constituting the second columnar refracting member row excluding the first columnar refracting member row existing at the end in the one direction among the plurality of rows constitutes the first columnar refracting member row. Shorter than the length of the columnar refractive member
A display device for an optical instrument characterized by the above. The display device for an optical apparatus according to claim 1,
Illuminating means for illuminating the indicator portion,
The direction of the inclination is a direction orthogonal to the optical axis of the light beam that illuminates the indicator portion,
Making the longitudinal direction of the columnar refractive member coincide with the direction of the inclination;
A display device for an optical instrument characterized by the above. In the display device of the optical apparatus according to claim 1 or 2,
Of the columnar refracting members constituting the second columnar refracting member row, the columnar refracting members disposed at the end portions in the other direction are shorter than the length of the other columnar refracting members in the row,
A display device for an optical instrument characterized by the above. In the display device of the optical apparatus according to any one of claims 1 to 3,
The screen is an optical member having refractive power,
The indicator portion is formed integrally with the optical member;
A display device for an optical instrument characterized by the above.

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