JPH04323506A - Camera with built-in length measurement device - Google Patents

Abstract

PURPOSE:To obtain a camera with a built-in measurement device built in, which does not give discredibility to a user by judging that there are a lot of errors in measurement values and thereby inhibiting display of measured length data when there is more than a certain level of distance to an object to be photographed. CONSTITUTION:An indication signal for carrying out in-finder display of a measured length data received is output by a body microcomputer 142, and whether to carry out display is judged by a lens microcomputer 42. At the time of measuring the size of an object to be photographed, since the accuracy in measuring distance is reduced as the object is goes away, whether to display measurement is judged in this process. An object distance data D is input, while a maximum detectable DMAX of the object stored in a lens ROM 44 is input. When the data D is larger than DMAX, a measurement NG signal is sent to the microcomputer 142, and when it is judged that there is no reliability in a length measurement operation, a length measurement mode switch is turned OFF, so as to carry out photographing in a normal photographing mode. When a display is judged appropriate, a display OK signal is sent to the microcomputer 142, and in-finder display of the measured length value is carried out.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera equipped with a length measuring device that measures the length or size of a subject based on the detection output of a distance sensor that measures the distance to the subject.

0002

[Prior Art] Conventional cameras with this type of object length measurement function measure the size of the object and display a scale as a guide to the object's size on the viewfinder or on the printed photo. There is a device designed to do this (see Japanese Patent Laid-Open No. 158507/1983). In addition, the actual size of the subject is calculated from data such as the shooting distance and focal length of the photographic lens, and the scale length data set within the viewfinder field of view, and this is displayed in the viewfinder, and the actual size and scale of the subject are displayed on the film surface. There is a length measuring device that can record the
(See Publication No. 9004).

0003

[Problems to be Solved by the Invention] However, when measuring the distance to a subject using a distance sensor, when the distance to the subject is long, it becomes difficult to quantitatively detect the focal position over a wide defocus range, making it difficult to measure the distance. In a camera such as the one described above that measures the length of a subject by calculation using distance measurement data, there is a problem in that the accuracy decreases and errors in the length measurement data increase. The present invention solves the above-mentioned problems, and when the subject is at a certain distance or more, it is determined that there is a large error in the length measurement value and the display of the length measurement data is prohibited or a warning is displayed. Accordingly, it is an object of the present invention to provide a camera with a built-in length measuring device that does not give a sense of distrust to the user.

0004

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a distance measurement sensor that measures the distance to a subject, and calculates the length or size of the subject based on the detection output of this distance measurement sensor. a display means for displaying the actual size of the object or a scale serving as a guide for the length or size of the object on a finder or the like based on the length measurement result obtained by the calculation; and the distance measuring sensor. a subject distance determining means for determining whether the subject is at a certain distance or more; and when the subject distance determining means determines that the subject is at a certain distance or more, the display means displays the actual size or scale of the subject; and warning means for prohibiting or displaying a warning. In addition, in the following embodiment, the lens microcomputer 42 constitutes the function achieving means of the above calculation means, object distance determination means, and warning means.

[0005]

[Operation] According to the above structure, the distance to the object is measured by the distance measuring sensor, and the length or size of the object is calculated by the calculating means based on the detection output of the distance measuring sensor. Further, based on the calculated length measurement result, the actual size of the subject or a scale serving as a guide for the length or size of the subject is displayed on a finder or the like by a display means. Here, the object distance determining means determines whether the object is at a certain distance or more, and if the object is at a certain distance or more, the warning means prohibits display of the actual size or scale of the object or displays a warning. .

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A single-lens reflex camera (hereinafter referred to as a camera) incorporating a length measuring device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the internal configuration of a camera incorporating a length measuring device according to this embodiment. In the figure, the camera body is composed of a camera body 1 and an interchangeable lens 2. Camera body 1 has reflex mirror 1
11 and a sub-mirror 112 arranged behind it, and this reflex mirror 111 is a colorless transparent glass substrate coated with a semi-transparent film, and reflects the light that has passed through the photographing lens 10 of the interchangeable lens 2. reflected and guided to the finder optical system. Further, a part of the light passes through the reflex mirror 111, is reflected by the sub-mirror 112, and is introduced into the focus detection optical system.

The focus detection optical system block 130 is composed of a condenser lens 131, a mirror 132, an imaging lens 133, and a CCD line sensor 134. The focus detection electric circuit block 140 (AF circuit) is connected to the CCD line sensor 134 (AF circuit) of the focus detection optical system block 130.
The amount of defocus is determined from the signal output from the sensor. Further, the camera body 1 includes a focusing plate 113, a pentaprism 114, and eyepiece lenses 115 and 116. A focal plane shutter (not shown) is provided at the rear of the camera body 1, and at the rear thereof, a film pressure plate is provided that guides the film 101 and is provided with holes for imprinting measurement data of the subject, etc. 102 is provided. Further, further behind the film pressure plate 102, a data display member 151 for displaying data etc. on a liquid crystal, a data imprinting optical system 152, and a light source 153 for data illumination are provided. A data control circuit 154 is provided to control the timing of imprinting.

The interchangeable lens 2 consists of a photographing lens 10, which is made up of lenses 11, 12, 13, 14, 15, and 16 built into a lens barrel, and a prism member 20 on the front side thereof. This prism member 20 is composed of two optical members 21 and 22. FIG. 2 shows the interchangeable lens 2 viewed from the front, and FIG. 3 shows the configuration of the distance measuring sensor provided below the photographic lens 10. In these figures, the ends of optical members 21 and 22 are cut diagonally, and are bonded together with an optical adhesive. At both ends of this diagonally cut portion, the portions outside the optical path of the photographic lens 10 (shaded portions 23 and 24 in FIG. 2) are vapor-deposited to reflect light, and the light incident on these portions is reflected. and guided below the photographing lens 10. Incidentally, since the optical path portion of the photographing lens 10 is bonded with an uncolored transparent adhesive, the light incident on this optical path portion passes through the optical members 21 and 22 without being reflected.

Reflection mirrors 25 and 26 are provided in the optical path reflected by the prism member 20, thereby deflecting the light beam to the left and right. Further, a mirror 27 is provided at the lower center of the prism member 20, and its reflecting surface 28,
29 further deflects the optical path deflected by the reflecting mirrors 25 and 26 in the direction of the optical axis of the photographing lens 10. A distance measuring optical system 30 is arranged in the optical path deflected by the mirror 27. This distance measuring optical system 30 includes a pair of imaging lenses 31 and 32 and a CCD line sensor 33 (distance measuring sensor). Each imaging lens is placed in the optical path of the light beam reflected by 23 and 24, respectively, and by electrically measuring the positional relationship between the two images with the imaging lens, the distance to the object can be determined. can. The lens 2 further includes a length measurement electric circuit block 40, which processes the signal output from the distance measurement optical system 30 and calculates the distance to the object and the actual length of the object corresponding to a certain length ( size). The length measurement electric circuit block 40 is electrically connected to the focus detection electric circuit block 140 of the camera body 1 through a bus line and terminals 70 and 170. The lens 2 also includes an LED array 51 for displaying the size of the subject in the finder, and data from the LED array 51 on the focusing plate 113.
It has a condensing lens 52 that focuses an image on it. In this way, all the elements necessary for length measurement are built into the interchangeable lens 2 side.

FIG. 4 is a block diagram of the electrical circuit of this camera. In the figure, first, the circuit on the camera body side will be explained. Body microcomputer 1 inside camera body 1
Reference numeral 42 controls an external circuit to perform a predetermined operation, and controls the entire camera body 1 . Further, a power supply circuit 143 is provided within the camera body 1 to supply power to each circuit block. The operating section 160 provided on the camera body 1 side includes a release operating member, a power zoom operating member, and a length measurement switch (not shown). This release operation member has a main switch S0 that supplies power to each circuit when the photographer touches it, and a main switch S0 that supplies power to the AF circuit when pressed slightly.
It consists of a switch S1 that starts the detection operation, and a switch S2 that releases the shutter when pressed further. In addition, the power zoom operation member is the photographing lens 10.
to control the zoom from telephoto to wide-angle. Further, the length measurement switch is used by the photographer to set whether or not to measure the length of the subject. The output of the operating section 160 is input to the body microcomputer 142, and the body microcomputer 142 outputs a signal to the power supply circuit 143 in response to a signal from the operating section 160 at the timing when the main switch S0 and switch S1 are turned on.

[0011] The power supply circuit 143 includes a body microcomputer 142.
Power is supplied to each circuit block according to an output signal from the microcomputer 142, and when a signal is output from the microcomputer 142 at the ON timing of the main switch S0, a power supply VBM is supplied to the microcomputer 142. Note that until then, the microcomputer 142 is in a standby state by a backup power source (not shown). Further, when a signal is output from the body microcomputer 142 at the ON timing of the switch S1, the power supply circuit 143 supplies the power supply VCC to the CCD line sensor 134 and the AD conversion circuit 141.
D1 and power supply VAD1 are supplied respectively. On the other hand, the body microcomputer 142 supplies the clock signal AFADCL to the AD conversion circuit 141. This clock signal is further supplied from the AD conversion circuit 141 to the same line sensor 134 as a clock signal AFCLK, and the AD conversion circuit 14
1 and CCD line sensor 134 start operating.

The CCD line sensor 134 integrates the charge for a time proportional to the brightness of the subject, and serially outputs the CCD pixel data signal AFDATA to the AD conversion circuit 141. After this data is converted into a digital signal by the AD conversion circuit 141, it is converted into a CCD pixel data signal AFD.
It is output to the body microcomputer 142 as ATA. The body microcomputer 142 uses this pixel data and focal length information, which will be described later, to calculate the amount of defocus based on an algorithm for adjusting the focus and detect the focus position. The calculated defocus amount is output to the motor driver 144,
Focus adjustment is performed by driving the AF motor M. Also, an imprint lamp 153 for imprinting the length measurement data onto the film.
is controlled by transistor 145. This transistor 145 is turned ON/OFF by the SCLON signal output from the body microcomputer 142 at a predetermined timing.
F is controlled, and the imprint lamp 153 is controlled.

Next, the circuit on the lens 2 side will be explained. As shown in FIG. 4, when the lens 2 is attached to the camera body 1, the circuit on the lens 2 side and the circuit on the camera body 1 side are electrically connected through six terminals and a bus line. Each signal transmitted through these bus lines will be explained below. The SREQL signal is a serial request signal sent from the lens microcomputer 42 provided on the lens 2 side to the body microcomputer 142. The SIN signal is sent from the lens microcomputer 42 to the body microcomputer 1.
This is a serial data signal sent to the lens microcomputer 42 through a line after the SREQL signal is output.
It is output from the body microcomputer 142. S.O.
The UT signal is a serial data signal transmitted from the body microcomputer 142 to the lens microcomputer 42, and this signal includes a power supply start signal, a length measurement start signal, and the like. The SCK signal is a clock signal sent from the body microcomputer 142 to the lens microcomputer 42.

The operation section 180 provided on the lens 2 side is
It consists of a film imprint setting switch. This film imprint setting switch is for setting whether or not to imprint length measurement data, etc. on the film surface. A lens microcomputer 42 inside the lens 2 controls an external circuit to perform a predetermined operation, and controls the entire lens 2. Operation unit 160 on the camera body side
When switch S1 is turned on, body microcomputer 1
S1ON SOUT signal from 42 is sent to lens microcomputer 4
2, and a signal is output to the power supply circuit 43. When this signal is input, the power supply circuit 43 supplies the power supply VC to the length measurement CCD line sensor 33 and the length measurement AD conversion circuit 41.
CD2 and power supply VAD2 are supplied respectively. This CCD line sensor 33 for length measurement starts a distance measurement operation when power is supplied, and sends the CCD pixel data signal DATA to the AD for length measurement.
Output to the conversion circuit 41. The AD conversion circuit 41 for length measurement is
The analog pixel signal output by the CCD line sensor 33 for length measurement is converted into a digital signal and output to the lens microcomputer 42 . Note that the lens microcomputer 42 supplies the clock pulse signal ADCL to the length measurement AD conversion circuit 41 at the timing of S1ON. This clock signal is further supplied as a clock pulse signal CLK from the AD conversion circuit 41 for length measurement to the CCD line sensor 33 for length measurement, thereby activating the CCD line sensor 33 for length measurement.

The lens 2 further includes a zoom encoder 60.
The focal length information signal ZD of the photographing lens 10
T is output to the lens microcomputer 42. The lens microcomputer 42 takes in this focal length information at a predetermined timing, and outputs this information as an SIN signal to the body microcomputer 142 in order to calculate the amount of defocus. Also, lens 2
has a lens ROM44, and this lens ROM4
4 stores aberration information of spherical aberration, chromatic aberration, and distortion aberration in the photographic lens 10, of which spherical aberration and chromatic aberration data are output to the camera body microcomputer 142 and used when correcting the amount of defocus. .

Further, the length measurement data is displayed in the infinder by the LED array 51 and the LED driver 45 that drives the LED array 51. Figure 5, Figure 6, Figure 7
, FIG. 8 shows an example of the scale, frame, and data display state displayed on the finder. FIG. 5 shows the display state of the scale and data during length measurement, and FIG. 6 similarly shows the display state of the frame and data during length measurement. FIG. 6 shows that data is displayed outside the photographic screen. Further, FIG. 7 shows the display state of the frame and data when selecting a length measurement frame, which will be described later. Note that the infinder display during length measurement is not limited to the scale and frame, and may be in a display mode as shown in FIG. 8. Here, the imprinting of the scale and data display onto the film can be set using an imprint setting switch (not shown) provided externally.

FIGS. 9, 10, and 11 are flowcharts showing the operations of the camera body 1 and lens 2 from when the camera body A starts to when it ends. In the figure, when the photographer touches the release operating member, the main switch S0 is turned on, and power is supplied to each circuit. Furthermore, the state is waiting for switch S1 to be turned on (
From step #1), when switch S1 is turned on, A
The power of the F circuit is turned on (#2). Next, the camera body microcomputer 142 outputs a signal to turn on the power of the lens 2 to the lens microcomputer 42 (#3), and starts operation on the lens 2 side (#61). Furthermore, the lens data is requested (#4), and based on this, the lens microcomputer 42
The lens data is read (#62), and this lens data is transferred to the camera body microcomputer 142 (#63). The camera body microcomputer 142 receives this data (#
5) Perform AF calculation using the AF circuit on the camera body 1 side (#6). The lens is extended based on the amount of lens defocus calculated by this AF calculation (#7),
As a result, it is checked whether the camera is in focus (#8), and if it is not, the process returns to #4 and this sequence is continued until the focus is achieved.

If it is determined in #8 that focus has been achieved, the process proceeds to #9, where it is determined whether the photographic lens currently in use is capable of measuring the size of the subject. If the lens cannot be measured (#9), the camera shifts to the normal shooting mode. (#11). If the lens is capable of length measurement, further check whether the length measurement switch, which allows the photographer to set whether or not to perform length measurement, is turned on (#10
), if not set, move to #11 normal shooting mode. When the length measurement switch is set, a signal instructing the start of length measurement is output from the camera body microcomputer 142 to the lens microcomputer 42 (#12), and the photographer further selects a length measurement frame according to the subject situation. (#1
3).

At #64, the lens microcomputer 42 is waiting for a length measurement start signal from the camera body microcomputer 142 (#64), and upon receiving the length measurement start signal, the distance measurement sensor on the lens 2 side starts measuring the length. Performs distance measurement (#65) and reads lens data (#66). Next, the data of the length measurement frame selected in #13 is transferred from the camera body microcomputer 142 to the lens microcomputer 42 (#14), and the lens microcomputer 42 reads this length measurement frame data (#67) and performs length measurement calculation. Do it (#68). on the other hand,
The camera body microcomputer 142 outputs a signal requesting length measurement data to the lens microcomputer 42 (#15), and based on this, the lens microcomputer 42 transfers the length measurement data (#15).
69, #70). The camera body microcomputer 142 receives this length measurement data transfer signal (#16).

Next, the camera body microcomputer 142 outputs an instruction signal to the lens microcomputer 42 to display the received length measurement data on the infinder (#17). When the lens microcomputer 42 receives the infinder display instruction signal (YES in #71), it determines whether display is possible (#7
2). As a result, if it is not appropriate to perform the infinder display (NO in #73), a length measurement NG signal is sent to the camera body microcomputer 142 (#74), and #1
Proceed to step 8 and further judge whether the length measurement operation was properly performed (#18). If it is determined that the length measurement operation is unreliable, proceed to #19 and turn off the length measurement mode switch. (
#19), the process proceeds to #20, and the subject is photographed in the normal photographing mode (#20). If it is appropriate to display at #73, the process proceeds to #75, where a display OK signal is sent to the camera body microcomputer 142 (#75), and the measured length value is displayed in the finder (#76).

In the camera body microcomputer 142, in #18 based on the received signal, if the length measurement operation is reliable, it waits for switch S2 to be turned on (#2
1) When the switch is turned on, photometry is performed (#22),
Perform automatic exposure calculation and check the brightness of the subject (#23). Next, check whether the subject has low brightness (#24)
, if the brightness is low, proceed to low brightness mode processing in order to take a picture with Flashmatic (FM) (#25)
. If the brightness is not low in #24, an instruction signal to turn off the infinder display of length measurement data is output to the lens microcomputer 42 (#26). When the lens microcomputer 42 receives the instruction signal (YES in #77), it turns off the infinder display (#78), sends a display OFF signal to the camera body microcomputer 142 (#79), and the lens microcomputer 42 operates. end.

[0022] The camera body microcomputer 142 has a display OF
After receiving the F signal (YES in #27), the exposure operation starts. During this exposure, the reflex mirror immediately in front of the film is raised (#28), and the aperture is stopped for automatic exposure control (#29). Then the shutter opens (
#30) After a predetermined time, the shutter closes (#31), the aperture opens (#32), and the reflex mirror returns to normal (#33). The length measurement data is then imprinted onto the film (#34), and the film is wound (#35). Next, wait for switch S2 to turn OFF (#36
), if it is turned off, wait for the switch S1 to turn off, and if it is turned off, the power to the lens 2 and the camera body 1 will be turned off.
The power is turned off (#38, #39), and the camera body microcomputer 142 ends its operation.

Next, the processing at low luminance will be explained using the flowchart shown in FIG. The low-brightness mode is performed when the subject is determined to be dark by automatic exposure calculation. When it is determined that the subject has low brightness, it is first checked to see if the flash is fully charged (#40). The process advances to #41 to perform photography in shutter mode (#41). When charging is completed, photography is performed using a flash, and an instruction signal to turn off the infinder display of length measurement data is output to the lens microcomputer 42 (#42). Based on this, the lens microcomputer 42 turns off the display (#80, #81
), then send the display OFF signal to the camera body microcomputer 1.
Send to 42. When the microcontroller receives it (#43
(YES), FM release processing is performed to perform flashmatic photography (#44). After shooting with Flashmatic, the length measurement data is imprinted on the film (
#45), the film is wound (#46). Next, wait for switch S2 to turn OFF (#47),
If it is turned off, wait for switch S1 to turn off (
#48), if turned off, the power to the lens 2 and the power to the camera body 1 are turned off (#49, #50), and the camera body microcomputer 142 ends its operation.

Next, the FM release process in the low brightness mode will be explained using the flowchart of FIG. 13. In this process, first, subject distance data D is input (#101), and then the aperture value F is calculated according to the shooting distance using a guide number (G.No.) that indicates the amount of light from a flash bulb, etc. (# 102). Here, the aperture value F is F=G. No. /D is calculated. Then, the obtained aperture value F is the maximum aperture value of the photographic lens. Check whether it is smaller than (#
103), open FNo. In cases above, set the appropriate aperture value to F.
and open FNo. When it is smaller than the appropriate aperture value, open FNo. Set the value. Next, the reflex mirror moves up (#106), and the aperture is stopped down to the aperture value F set above (#107). After that, open the shutter (#108), and when the shutter is fully open (#10
9: YES), the flash fires (#110). After the exposure is completed, the shutter is closed (#111). after that,
Open the aperture (#112), return the reflex mirror (#113), and return.

Next, FIG.
This will be explained using a flowchart. This process determines whether or not to display the length measurement, taking into account that when measuring the size of the object, distance measurement accuracy decreases as the distance to the object increases. In this process, first, subject distance data D is input (#121), and then the lens ROM 44
The farthest detectable distance of the object stored in DMAX
(#122). And object distance data D
It is checked whether DMAX is greater than the farthest detectable distance of the subject (#123), and if it is smaller than DMAX, the display OK flag is set to "1"(#124), and the process returns. If it is larger than DMAX, it is determined that an accurate length measurement value cannot be obtained even if distance measurement is performed, the display OK flag is set to "0"(#125), and the process returns.

Next, the length measurement calculation when measuring the length of the object will be explained using the flowchart of FIG. 15 and FIG. 16. First, the object distance data D detected by the distance measuring sensor provided in the lens is input (#131), and then the focal length f of the photographing lens stored in the lens ROM 44 is input (#132). Furthermore, the scale dimension Sn for display on the film arbitrarily selected by the photographer
are input (#133), the length measurement value S of the object is calculated using these values (#134), and the process returns. Here,
The length measurement value S is calculated by S=D×Sn/f.

Next, the operation of length measurement frame selection during length measurement will be explained using the flowchart of FIG. 17 and FIG. When the length measurement switch is turned on and a signal instructing the start of length measurement is output, all length measurement frames displayed in the finder flash (#141). Then, wait for 3 seconds to pass (#1
42), and when it has elapsed, set the distance measurement frame data W to 1 (#1
43), and lights up this set frame (#144). Next, check whether the length measurement frame selection switch has been turned on by the photographer (#145), and if it has not been turned on, wait for another 1 second to elapse (#148). Assume that the frame is used as a length measurement frame (
#149), return. Also, if the measurement frame selection switch is turned on in #145, the switch is turned off.
(#146), then add 1 to the ranging frame data W set in #143 (#147), and
Returning to step 4, the next distance measurement frame data frame is displayed. By repeating this processing loop, a length measurement frame is selected according to the size of the subject, as shown in FIG.

Next, errors in length measurement values due to various aberrations of the photographic lens will be explained with reference to FIGS. 18 and 19. FIG. 18 shows an example of the phenomenon of distortion aberration, and FIG. 19 shows an example of distortion aberration during various photographing times with a zoom lens. Distortion is a phenomenon in which an image is distorted between the center and the periphery of the photographic field due to aberrations of the photographic lens, and during exposure, the image is formed as is on the film surface. In the graph of FIG. 19, the horizontal axis shows the image height, and the vertical axis shows the degree of distortion (%). FIG. 19(a) shows the distortion state during telephoto mode, and the distortion aberration is in the + direction. FIG. 19(b) shows the distorted state during normal photographing, and the distortion aberration is relatively small. FIG. 19(c) shows the distortion state at wide-angle, and the distortion is in the - direction. Here, the distortion is +
In the case of , the farther from the optical axis the greater the magnification, as shown in Figure 1.
As shown in Figure 8, the image has a pincushion shape. Also, the distortion aberration is −
In this case, the farther from the optical axis the smaller the magnification becomes, and the image becomes barrel-shaped. Therefore, when copying length measurement data and scale onto the film surface, especially when obtaining length measurement data over a wide range of the screen, it is necessary to take the above-mentioned distortion into account and correct the length measurement data and scale before displaying them. There is.

The distortion aberration data stored in the lens ROM 44 is used to correct the length measurement data and scale according to the photographic lens 10 used. Regarding the scale correction, the intervals between the scale marks per unit length are set at unequal intervals depending on the degree of distortion. When using a zoom lens, as mentioned above, the degree of distortion changes depending on zooming, so in order to compensate for this,
Information from the zoom encoder 60 is input to the lens ROM 44, and distortion aberration data corresponding to changes due to the f-number of the photographing lens 10 is transmitted from the lens ROM 44 to the lens microcomputer 4.
It is configured so that it is output to 2. Incidentally, when the above-mentioned distance measurement sensor is provided in the interchangeable lens as in the above embodiment, the base line length can be made larger, so that it is possible to improve the distance measurement accuracy.

[0030]

[Effects of the Invention] As described above, according to the present invention, when measuring the size of an object by measuring the distance to the object, when the object is at a certain distance or more, there are many errors in the length measurement data. Taking this into consideration, the display of length measurement data is prohibited or a warning is displayed, which prevents the photographer from mistakenly recognizing length measurement data with errors as correct data. There will be no distrust.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the internal functional configuration of a single-lens reflex camera incorporating a length measuring device according to an embodiment of the present invention.

FIG. 2 is a front view of the photographing lens in the same camera.

FIG. 3 is a diagram illustrating the concept of a distance measurement sensor provided within the photographing lens of the same camera.

FIG. 4 is a block diagram showing an electric circuit in the same camera.

FIG. 5 is a diagram showing an example of the scale and data displayed on the finder during length measurement in the same camera.

FIG. 6 is a diagram showing an example of a frame and data displayed on the finder during length measurement in the same camera.

FIG. 7 is a diagram showing an example of the display of the frame and data displayed on the finder when the length measurement frame is selected in the same camera.

FIG. 8 is a diagram showing another example of the display during length measurement.

FIG. 9 is a flowchart showing the operation of the same camera from the startup state to the end.

FIG. 10 is a flowchart similar to the above.

FIG. 11 is a flowchart similar to the above.

FIG. 12 is a flowchart showing operations in low brightness mode.

FIG. 13 is a flowchart showing the operation of flashmatic photography.

FIG. 14 is a flowchart illustrating the operation of determining whether length measurement data, etc. can be displayed.

FIG. 15 is a flowchart of a length measurement calculation algorithm.

FIG. 16 is a diagram showing the relationship between the object distance and the focal length of the photographic lens in the length measurement calculation algorithm.

FIG. 17 is a flowchart showing the operation when selecting a length measurement frame.

FIG. 18 is a diagram showing distortion aberration of a photographing lens.

FIG. 19 is a graph showing the degree of distortion during telephoto shooting, wide shooting, and normal shooting when using a zoom lens.

[Explanation of symbols]

1 Camera body 2 Interchangeable lenses 10 Photography lens 30 Distance measuring optical system 51 LED array 151 Data display member

Claims (1)

[Claims] [Claim 1] A distance measurement sensor that measures a distance to a subject;
a calculating means for calculating the length or size of the object based on the detection output of the distance sensor; and calculating means for calculating the actual size of the object or the length or size of the object based on the length measurement result obtained by the calculation. a display means for displaying a scale on a finder or the like to serve as a guideline; a subject distance determination means for determining whether the subject is at a certain distance or more using the distance measuring sensor; A camera having a built-in length measuring device, characterized in that the camera includes a warning means for prohibiting the display means from displaying the actual size or scale of the object or for displaying a warning when it is determined that the actual size or scale of the object is present.