JPS5926020A - Exposure display device - Google Patents

Abstract

PURPOSE:To eliminate the need for a gray scale and to simplify constitution by providing a dot display means having plural visual display elements in an array and a display plate which is rotatable around one point of the center part of a display window and has two display areas differing in light transmission or reflection characteristics. CONSTITUTION:The display window 10 is provided to a side surface of a photometer body 2. A liquid-crystal dot display device 26 is provided inside of the window 10, and the device 26 performs display by the difference of the exposure value determined by the metered brightness value of a subject and a film sensitivity value set with a dial 12 from the exposure value determined by an aperture value and a shutter speed set with dials 14 and 16. Display values whose number corresponds to the frequency of photometry are obtained. Further, the display plate 32 which is rotated around the point 30 by an operation knob 28 is provide inside of the window 10, and the display plate 32 has the display areas 38 and 40 differing in light transmissivity on both sides of the diagonal of a rectangular plate 34. Thus, reproduction density is known from the ratio of the display areas 38 and 40 defined by long sides 10a and 10c opposing to a driven display element.

Description

Detailed Description of the Invention Technical Field The present invention relates to a display device for a spot meter or the like that measures the luminance of a relatively narrow head-mounted area on a subject, and particularly to a display device for a spot meter or the like that measures the luminance of a relatively narrow overhead area of a subject, and in particular, a display device that measures the brightness of a film or the like at an angle of 11 degrees, such as the area being photometered. It relates to a twisting, H, j:X device that displays how it is reproduced.

Prior Art A dot display device in which many display elements such as light emitting diodes are arranged in rows can simultaneously display a plurality of photometric values for a suitable part of the subject and visually show the difference between the plurality of photometric values. A photometer has been proposed that allows the user to understand the Furthermore, a strip-shaped gray scale whose density changes stepwise from white to black from one end to the other is arranged parallel to the dot row of the display device of such a metering photometer, so that the display 111 can be seen. A method has been proposed that provides an indication of the density of reproduction when the corresponding luminance portion is reproduced on film, photographic paper, etc.

Incidentally, the latitude of a film generally varies depending on the type of film, and especially for monochrome films, the sensitivity and latitude can be controlled by appropriately controlling the development process without changing the development time. For this reason, even if a gray scale is arranged in a dot row, this will only be applicable to films that have specific exposure dose-reproduction density characteristics (reproduction characteristics) and are processed under specific conditions. Is it possible to make the concentration gradient of the clay scale itself variable in accordance with the reproduction characteristics?To realize such a gray scale, for example, it is possible to provide multiple types of gray scales that can be selected. The device becomes complicated.

An object of the present invention is to provide a fighting men display device which has a reproducibility display means that can correspond to the "11 current characteristics" of the gods of film, with an extremely simple configuration, instead of the above-mentioned gray scale. It is said that

SUMMARY In order to achieve this object, the present invention provides a dot display means in which a plurality of display elements are arranged in a row and are selectively driven. A table with two long sides /I'%: ri× and a display board facing the front of the display is arranged in the display window, and the display board rotates around a point in the center of the display window. The display surface is supported as shown in FIG. 1) In response to an external operation, the boundary line intersects the long side of the display window at a desired angle and faces the driven display element on the long side of the display window. The exposed display device is numbered to indicate the reproduction layer by the combination of ':'ii:' in the display area between the points.

Embodiment In FIG. 1 showing an embodiment of the present invention, a photometer main body (
2) is 1) ff1ip which includes an imaging lens in the 11th part.
Body (4), eyepiece lens (6) at the rear, clip at the bottom (
8) It is a provision. On the side of the main unit, there is a display window (10), film sensitivity set dial (12), aperture value setting dial (14), and shutter speed set dial (16).
), memory switch (18), reset switch (20)
), and a power switch (22) is provided. Furthermore, the clip (8) is equipped with an operation button (2) for operating the photometry switch.
4) is a provision.

A liquid crystal dot display device (26), which will be described later, is provided inside the display window (10). In this display device (26),
Aperture (11) set with dials (14) and (16)
1 and shutter speed 41'i I',
Film sensitivity IW set with the photometered subject brightness value 13v and dial (12) based on v t and C11
Both lights 4 (C4F, v 2 determined by the value Sv) are displayed by increasing them by 05 steps based on the difference between the values of both lights.

The exposure value Ev2 is determined by measuring light at multiple points in the scene.
The number of photos can be obtained depending on the number of times the photometry is performed.

Difference between exposure values Ev1 and 1iv2 (Ev 2-1iv l)
When is O, the central display element (LO) is in the display state. In the 11th example 10), the difference in exposure value is +351・all,
The cases of -2 stages and -5 stages are shown. 1st display window (
10) is provided with a display plate (32) that rotates counterclockwise or clockwise around a point (30) when the operating knob (28) is moved up or down.

This display board (32) is located at the diagonal line (36
) is the dividing line, and one display area (38)
The display area (40) has a good transmittance, while the display area (40) has a low transmittance.

However, the low-transmittance surface area (40) has a sufficient degree of permeability and scratches to make it visible to the corresponding liquid crystal display, and is colored red, green, or any other suitable color. ing.

If the display board (, 3lI') is made of dot arrays or liquid crystal, it can also be placed on the front and back sides of the liquid crystal display board. Also, display the dot string Pg(lo)
It may be placed outside the frame in line 11 with the long side of the window. In such a case, the display panel (34) has a reflective configuration.

The display board (34) has an operation knob (2) that slides in the direction of the arrow.
There is also a pawl groove (42) that engages with a pin integral with 8), which rotates around a point (30) in the center of the display window (10) in response to sliding of the operating knob (28). FIG. 2 (al) shows the case where the latitude of the film is small, that is, the characteristic curve of the film has a steep slope, and FIG. 2 (1) shows the case where the latitude of the film is large and the characteristic curve has a steep slope.

In Figure 2 ta), the border line (36) is the length a of the display window.
+0a) (101)) and the intersection point (10C), (10d
) is sandwiched between two display positions corresponding to fir! The area corresponds to the 111 current area of the film. The right side of the point (10d) shows the 1-4 area, which becomes a dark area and has no difference in density when expressed on photographic paper at 11F, and the left side of the point (IOC) shows the corner 1 area, which appears white.

However, in practice, there is no problem with a curved display as shown. The user questions the long iQ (10”) (blacked out in the figure) to the display element (blacked out in the figure) that has been activated.
Display 1 "・li (38) (
Do you know the reproduction density 1 morning by the width ratio of old))?-C
Wear. In the example shown in Figure 1, the table subregion (40
) indicates that the culm 11 and the culm 1 course are high.

Next, one embodiment of the circuit and optical system of the photometer shown above will be described.

・In Figure 3, there is a half mirror (46) that directs the light that has passed through the imaging lens (41I) to the regular light system and finder thread, and a condenser lens (48) that condenses the reflected light. , Penck prism (5
o), an eyepiece (50a), etc. constitute the finer lens system of the photometer. Imaging lens (4lI))1
', the imaging plane of the vehicle (52) l- is provided with an aperture (511) for realizing a light receiving J/I of, for example, 1/31 Lie, and a photodiode is placed at i'r I'2. (56)
Or P.1 himself. 1 including hototai'-to (56)
The llpl optical circuit (58) has an electric IF, kj "T, which has a linear relationship with the logarithm of the intensity of light incident on the photoquote.
Output. A-n4H, ;φ circuit (60) repeatedly converts the output of the photometric circuit (58) into a tintal value. A small time detection circuit ((52L (+54)
・A-1) while the side light switch (66) is closed by pressing 1・V・Activation button (24) in Figure 11
The acid fire value and 1 decimal point 411J of the symbols output from the variable circuit (60) are detected. Most colonized detection circuit (62
) contains a comparison circuit inside l~-1) 414i4 circuit (60) compares the value manually inputted in 6'11 with the value manually inputted this time, and if the human input this time is greater, then U )
The data of the 11th time is stored in the memory (76
), and in the opposite case, hold the pano J value of one time. The minimum value detection circuit (64) also performs a similar comparison operation.
Then, store the smaller manpower in order. Metering switch (
66) is opened, the detection IJtJ) operation is stopped and the detected maximum and minimum values are stored in the memory (76), (78).
) is held. When the reset switch (68) is closed, the maximum value and the minimum value detection circuit IT8 (62),
(64) is reset, memories (74), (76),
(78) is cleared. When the memory switch (70) is closed, the memory switch (74) retains the data stored at that time.

The encoder (80) adjusts the film feel to be set.
, 12. ; generates a digital signal. The addition circuit (82) takes in the instant niq+li In1iII-y4j from the memories (74), (76), and (78), and from this and the film feeling 1ψ information, it calculates I. Do the addition of jji and r'x light 4u'
Outputs a signal equivalent to +15v2. Encoder (8
4).

(8G) generates a digital signal according to the set aperture value and shutter speed, and the filter circuit (88) adds the outputs of the encoders (84) and (86) to produce a digital signal corresponding to the Kv summer. Output a signal. The subtraction circuit (90) outputs a signal corresponding to the difference between the output values Jiv1 and EV2.

Memories (74), (76), and (78) are memory (92).
), (94), (96) corresponding to the data
Take in the outputs of R(90) respectively. memory (92),
(94), (!l 6 ) data is sent to the decoder (98)
, (+00), and (DJ2), respectively. Each decoder has an output terminal which corresponds to the number of +-r- by χ·1) and υ) output terminals, and depending on the data to be received, outputs the "quotient" from either one of the terminals. Outputs I＾吾. 11″1
'1, Real/7i (Li) Each decoder is provided with 29 output terminals.

In these decoders, ICi'1-O)1 falling light ()
The Ili input terminal of each decoder which outputs the signal 14 which is i'y for the difference amount of +'+ is connected to the same OR gate. Once upon a time, such a Utt Kate was used for 291,
It will be booked. These OR Kates (104-1) to (104
The output terminal of -29) is connected to the dot display device (+06). The dot display device (106) is arranged in rows of 29 11 crystal display elements (106-1) to (H)6-29), and each display element is arranged in (104-1) rows. ) to (10・l-29), and corresponds to 01(
Due to the "quotient" Ichikawa signal from Tate, the 41st was driven to the 2nd direction.
# is done.

Note that as a display element, a diode or other suitable device may be used instead of a liquid crystal. In the above configuration, the sequence operation of the system and the signal 7'fli'
Control signals necessary for control are generated by the system control circuit (74).

Next, the operation will be explained. When the power switch (72) is turned on, a reset signal is issued from the system control circuit (74) in response, and the maximum value and minimum value detection circuit (6
2), (64) is reset and the memory (74).

(76) and (78) are cleared.

While the photometry switch (66) 1114 is on, photometry values are repeatedly loaded only into the memory (74), and only the corresponding display is continuously performed.

Next, the photometric switch (66) is closed, and up to 11 cities,
When the detection operation for the minimum value is specified, detection of the maximum value and minimum value is started, and the detection continues until the photometry switch is opened. During this detected intercostal space, the data detected each time is taken into the memo'J (76) and (78), respectively, and the corresponding values are simultaneously displayed on the table display device. The user changes the direction of the photometer so that it traces the bright and dark areas of the subject through pointing. When the photometric switch (66) is opened after tracing, the maximum and minimum values output from the photometric circuit (58) during that time are held. Look at the displayed values for these and adjust the aperture value and shutter speed so that they are within the latitude of the film]
Adjust this. Alternatively, depending on your drawing intention, you may move the bright area outside the latitude to create a foggy effect. Next, set the reset switch (+) 8) to -1jI.
When closed at 100
2) is also set to the initial state when it is turned on.

When the photometering switch (66) is closed once after resetting, the detection operation or detection of the number of songs → rl + operation (1F open) is started.

Son, the user uses a spot-side light source to scan or swipe the underworld, and shows the photometer that displays the photometric values of the maximum brightness part and the minimum brightness part of the scanned part. In other words, the present invention is limited to this type of photometer. For example, rv number of light receiving elements are placed in front of the imaging lens, and the output is processed to calculate the photometric value of the field. A six-way meter with a split metering method that obtains maximum and minimum values, and multiple memories similar to Memo IJ (74) in Figure 3 are installed to store photometric values at multiple arbitrary points in the subject. , display 1
It can be applied to the light meter of the gods such as the Norimeter.

Effects According to the present invention described above, it is possible to visually easily recognize where the photometric value is located in the il range of the film, and the display range and reproduction density gradient can be easily determined depending on the reproduction characteristics of the film. It is possible to provide a photometer equipped with a latitude display function with an extremely simple configuration that can be used to display the latitude at any time.

[Brief Description of the Drawings] Figure 1 shows the exterior side of the photometer of the present invention... Figure 1 and Figure 2 show
Latitude setting Satoru's i'l+', dose, ・831
1 is a circuit diagram showing the circuit configuration of a photometer. 26: Dot display means, 34゛ display 4N38.40
:Display area, 101 display windows 10a, 10b
'Long side, 30 center of display unit 28
:Operation knob applicant Minolta Camera Co., Ltd.

Claims (1)

[Claims] 1. A dot display means in which a plurality of visual display elements are arranged in a row, a display window each having two sides parallel to the row of display elements, and a dot display device that rotates around a point in the center of the display window. It has two display areas separated by a boundary line passing through its center of rotation and each having hazy light transmission characteristics or reflection characteristics, and the display area partially faces the display window. a display board disposed; and a setting mechanism that rotates the display board in response to a setting operation from the outside and sets the position of the display board so that the boundary line intersects the two sides of the display window at a desired angle; a display drive circuit that selectively puts a display element into an activated state according to photometric values and set exposure factor information; A display device that shows the reproduction density based on the ratio.