JP3216651B2 - Distance measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distance measuring device and, more particularly, to a distance measuring device for measuring a wide-field subject distance in an ordinary camera, video camera, or the like.

[0002]

2. Description of the Related Art In recent years, as camera automation has progressed, focusing techniques have also been developed to overcome subjects that are difficult to measure (distance measurement), but have not yet been satisfied. However, the following cases must be addressed. That is, (1) Distance measurement is performed on a subject at a long distance by so-called active auto focus (hereinafter, referred to as AF) in which distance measurement light is projected on the subject and the distance is measured based on a light receiving signal of the reflected light. (2) To measure the distance of a subject existing outside the central part of the shooting screen, that is, to measure the distance to prevent hollowing out.

In response to such a demand, the present applicant has already applied a technique (multi-A) in which light for distance measurement is projected to a plurality of points on the screen and distance measurement is performed.
F) (see Japanese Patent Application Laid-Open No. 2-186313).

[0004]

However, the above-mentioned prior art has the following problems. First, when trying to measure the distance across the shooting screen, the number of light emitting means of the distance measuring light increases, so that it becomes impossible to make a compact design of the camera because of taking up space, and the cost is increased. . Further, in a camera having a variable angle of view, such as a camera with a zoom lens, an area may not be able to be covered even when the number of projected distance measuring lights is increased. Accordingly, there is a problem that the cost of the light receiving means is increased.

Next, the problem of the camera with a zoom lens will be described in some detail with reference to FIGS. 10 and 11. For example, as shown in FIGS. When the distance is measured, as shown in FIG. 11, three beams 31a to 31c are projected toward the subject via the light projecting lens 32, but the distance cannot be measured between the beams. If the beams 31a to 31c are projected at appropriate intervals at the telephoto end of the taking lens as shown in FIG. 10A, the beam positions are concentrated at the center at the wide end as shown in FIG. The result. In order to solve this problem, means such as projecting a large amount of distance measuring light into the screen can be considered, but as the area and the number of light emitting and receiving elements increase, the cost increases as described above. Will be lost.

Therefore, the distance measuring device disclosed in Japanese Patent Publication No. 1-5971 rotates and scans the distance measuring unit near the main subject.
The above problem has been solved by performing focus adjustment based on the shortest distance information obtained from the distance measuring unit.

However, when using such a rotating part,
If the size is too large, driving becomes difficult, and there is a restriction in assembling into a camera. Therefore, it is necessary to reduce the size of the rotating portion, but in order to reduce the size, it is necessary to reduce the size of the light emitting and receiving lens, and it is necessary to reduce the interval between the light emitting and receiving portions, that is, the base line length. Therefore, the range of the distance detection becomes narrow. The reason will be described in more detail below. FIG. 12 is a light path diagram of a triangular distance measuring method having a light emitting and receiving unit, and as shown in FIG.
The infrared light for distance measurement emitted from a D (infrared light emitting diode) 35 passes through a light projecting lens 34 to a subject 38 at a distance L.
projected on a. The reflected light forms an image on a PSD (semiconductor position detecting element) 37 via a light receiving lens 36. The incident position x of the reflected light on the PSD 37 with reference to the optical axis position of the light receiving lens 36 is given by: f = the focal length, and s the base line length between the light emitting / receiving lenses 34 and 36; f / L Satisfies the relational expression of (1). That is, the subject distance L is obtained from x.

The output photocurrents I1 and I2 of the PSD 37 are
Is as follows: I1 = {(a + x) / t)}. I0 (2) I2 = {t- (a + x)} / t} .i0 ... (3) However, a is the light receiving lens 36 from the end of the PSD 37.
, T indicates the total length of the PSD 37, and i0 indicates the total signal light current.

Accordingly, the following equation is established: {I1 / (I1 + I2)} = (a + x) / t = a / t + {(sf) / t} / L (4) The value of the reciprocal 1 / L of the distance can be obtained without including the power i.sub.0 and i.sub.0 depending on the reflectance of the object. That is, from equation (4), 1 / L = {t / (s.f)}. {I1 / (I1 + I2) -a / t} (5) Also, 1 / L is minute in equation (4). When s · f is large and t is small, I1 / (I1 +
It can be seen that an AF device having a large change in I2) and a good distance resolution can be provided.

On the other hand, when the subject is located at the position 38b in FIG.
7 and the distance cannot be measured. That is, the closest distance Lmin that can be detected by the PSD 37 is, assuming that the light emitting and receiving spot is a point, from the equation (1), Lmin = s · f / (ta) …………………. (6) Accordingly, as s · f is smaller and t is larger, distance measurement to a nearby subject becomes possible.

As described above, reducing s · f is effective at short distances, but degrades the distance resolution. In particular, it is sufficient for distant subjects where reflected signal light is weak. Performance may not be obtained.

An object of the present invention is to provide a distance measuring apparatus which solves the above-mentioned problems of the prior art, is compact, can measure distances with high accuracy over a wide range of distances, and has a function of preventing hollow holes. That is.

[0013]

SUMMARY OF THE INVENTION A first distance measuring device according to the present invention rotates and scans a measurement screen to measure a distance.
Light projecting means for projecting light for use, and a light
A first light receiving unit for measuring a short distance, comprising a first light receiving lens and a first sensor for moving and receiving an optical signal related to the subject distance; and the first light receiving unit is provided separately. a second light receiving means for long range measurements made of the second light-receiving lens and a second sensor for receiving the light signal associated with the subject distance of the central portion near the inside measurement screen, projecting the light projecting means
Detecting the light direction, and projecting the light in the predetermined direction.
Control means for operating the means, and arithmetic means for determining a definite distance value based on the outputs of the first and second light receiving means, wherein the light projecting means and the first light receiving means are provided.
The base line length of S1, the light projecting means and the second light receiving means
Is S2, and the focal length of the first light receiving lens is f.
1. When the focal length of the second light receiving lens is f2
By satisfying the condition of S1 · f1 <S2 · f2,
Distance of the second light receiving means as compared with the first light receiving means.
Characterized in that the distance resolution on the side is increased . Further, the second distance measuring device according to the present invention is provided with a light projecting means for projecting distance measuring light to a subject via a light projecting lens, and at a position separated from the light projecting lens by a first base line length S1. And
A first light receiving lens having a first focal length f1, and a first light receiving sensor having a total length t1 for receiving reflected light of the distance measuring light from the subject via the first light receiving lens. A light receiving means, a rotating means for integrally rotating the light projecting means and the first light receiving means, and a second light emitting element. A second light receiving lens having a second focal length f2, and the light measuring means via the second light receiving lens when the light projecting means projects the distance measuring light in a direction coinciding with the photographing optical axis. Receives the reflected light of the distance light from the subject .
A second light receiving means including a second light receiving sensor having an overall length t2, and a calculating means for determining a fixed distance value based on the outputs of the first and second light receiving means. , S1, S2, f1, f2 , t1, and t2 are equal to S1
It satisfies the condition of f1 / t1 <S2 / f2 / t2 . The third of the distance measuring apparatus according to the present invention, the first placed at a position spaced apart by a first baseline length S1, and, through a second lens, the first lens
Light projecting means for projecting light for distance measurement, and the second lens
Receives the reflected light from the subject of the distance measuring light via the
First distance measuring means including a first light receiving sensor;
Rotating means for rotating the distance measuring means, a third lens fixed at a position separated from the first lens by a second base line length S2, and the distance measuring means via the third lens. For light
A second receiver for receiving reflected light from a specific point in the screen
A second distance measuring means including an optical sensor; and a calculating means for determining a fixed distance value based on an output of the first and second distance measuring means, wherein the second lens Focal length
Is f1 and the focal length of the third lens is f2
In addition, the condition that S1 · f1 <S2 · f2 is satisfied . Further, a fourth distance measuring device according to the present invention comprises: a light projecting means capable of projecting light for distance measurement so as to scan the inside of a measurement screen; a detecting means for detecting a scanning position of the light projecting means; Rotates together with the light emitting means to receive the reflected light of the distance measuring light at a plurality of measurement points
A first light receiving unit that outputs a plurality of distance-related signals;
A second light receiving means for receiving reflected light of the distance measuring light from a specific point on the screen and outputting a distance-related signal when detecting an executable state in accordance with a detection result of the detecting means; 1 and on the basis of the output of the second light receiving means, comprising a calculating means for determining a definite distance values, and the second receiving
The light means is a distance measuring and dissolving part on the far side than the first light receiving means.
Function is set to be high, and the calculating means
Each distance output of the light means is longer than a predetermined long distance determination distance value.
If it is a distance, the distance output of the second light receiving means is increased.
It is characterized in that it is determined as the fixed distance value .

[0014]

The object distance is calculated by the calculating means based on the object distance calculated by the outputs of the first and second light receiving means.
To determine.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. 1 and 2 are external views of a camera having a built-in distance measuring device according to a first embodiment of the present invention. As shown in the drawing, a camera body 16 having a photographing lens 17 whose optical axis is O1 is shown in FIG. A rotatable holding frame 6 having light emitting and receiving lenses 1 and 2, which are detection units of the distance measuring device, and a light receiving lens 3 are disposed on the left and right sides of a front view of the finder 18. FIGS. 3 and 4 are diagrams showing a configuration of the detection unit of the distance measuring device and an operation state thereof. The detection unit includes a rotation unit, a fixed unit, and a reference position detection switch 8 as a position detection member.

The turning portion is a turning holding frame 6 of a turning member which is rotatably supported by the camera body 16 in a horizontal direction (θ direction in FIG. 4), and a light projection held by the holding frame 6. The light emitting lens 1 and the IRED 4 are provided as means, and the light receiving lens 2 and the PSD 5 of the first light receiving means provided in parallel with the light emitting means. The distance measurement value by the scanning distance measurement optical system is applied to a relatively short distance measurement value. On the other hand, the fixed portion is disposed at a predetermined interval with respect to the rotating portion, is a second light receiving means, the light receiving lens 3 whose optical axis is parallel to the optical axis O1 of the taking lens 17, And a PSD 7 disposed opposite to the light receiving lens 3. The distance measurement value by the second light receiving means is applied to a relatively long distance measurement value. Note that a base line length s1 which is an interval between the light projecting lens 1 and the IRED 4 and the light receiving lens 2 and the PSD 5
Than the light projecting lens 1 and the IRED 4 and the light receiving lens 3
And the base line length s2, which is the distance from the PSD 7, is set longer. The focal lengths of the light receiving lenses 2 and 3 are f1 and f2, respectively, and the total lengths of the PSDs 5 and 7 are t1 and t2, respectively.

In the above-mentioned detecting section, the projection light for distance measurement from the IRED 4 is reflected by the subject 9a, and is reflected by the PSD 5 or 7.
To receive light. When the holding frame 6 rotates, the light emitting and receiving lenses 1 and 2, the IRED 4 and the PS
At D5, the projected light scans the subject in the shooting screen in the horizontal direction while the relative positional relationship is fixed, and the reflected light is incident on the PSD5. Therefore, if the distance from the light projecting lens 1 to the objects 9a and 9b is the same, the output from the PSD 5 does not change irrespective of its rotational position, that is, the projection direction of the distance measuring projection light from the IRED 4. . FIG. 3 shows an operation state when the optical axis O2 of the light projecting lens 2 and the optical axis O1 (see FIG. 2) of the photographing lens 21 substantially coincide with each other when the holding frame 6 is rotated. When the holding frame 6 is at this position, the reference position detection switch 8 is turned on, and the long distance measurement can be executed. In this state, the light projecting lens 1 and the light receiving lens 3
Are substantially parallel. FIG. 4 shows a state in which the holding frame 6 is rotated and the detection switch 8 is turned off, and a state in which the distance measurement information is obtained by scanning the light emitting and receiving at the time of relatively short distance measurement. is there.

FIG. 5 is a main block diagram of an electric control circuit of the distance measuring apparatus. As shown in FIG. 5, in the above control circuit, the CPU 10 rotates the holding frame 6 via the actuator 15 for each rotation. Drive to position. This rotation angle θ
Is detected by a position detection circuit 8A including the detection switch 8. At each rotation angle θ, the IRED 4 is intermittently turned on in a pulse form via the driver 12. In response to the lighting, the photocurrents I1 and I2 based on the expressions (2) and (3) are input from the PSD 5 to the first ratio calculation circuit 11, and the calculation based on the expression (4) is performed. . The first
The calculation result of the ratio calculation circuit 11 is input to the CPU 10,
The first calculating means calculates the subject distance at each scanning point based on the above equation (5). And the CPU 10
The subject distance is stored in the memory unit.

In the state of the holding frame 6 shown in FIG. 3 in which the reference position detection switch 8 is turned on, the PSD 5 corresponds to the lighting of the IRED 4 at the same time as the distance measurement operation by the PSD 5.
7, the photocurrent I1, based on the equations (2) and (3),
I2 is input to the second ratio calculation circuit 13, and a calculation based on equation (4) is similarly performed. The calculation result of the second ratio calculation circuit 13 is input to the CPU 10, and the second calculation means calculates the subject distance at the center based on the above equation (5). Then, the subject distance is stored in the memory unit of the CPU 10.

Further, the CPU 10 determines whether any one of the distances obtained by the first calculating means is a predetermined distance discrimination distance L described later.
When the value indicates a value closer to 0, the closest object distance calculated by the first calculating means is adopted as a definite value, and each of the distances by the first calculating means is larger than a predetermined distance determination distance L0. If the distance is too far, a decision means for selecting a decided value to be output by adopting the subject distance computed by the second computing means as the decided value is incorporated. The above CPU
The first and second calculation means incorporated in 10 may be partially processed by the same processing unit. In addition, (2),
The constant focal length f, the reference length s, the length a from the end of the PSD to the optical axis position of the light receiving lens, and the total length t of the PSD used in the equations (3), (4), and (5) are PSD5, respectively. For the constants f1, s1, a1, t1, and PSD
7 are replaced by constants f2, s2, a2, and t2, respectively.

The distance measuring operation of the distance measuring apparatus of the present embodiment constructed as described above will be described with reference to a time chart of FIG. In this case, the number of distance measurement points in the screen due to the rotation of the holding frame 6 is five. First, the holding frame 6 is rotated by the actuator 14 to the position of the rotation angle θ1 in FIG.
The ED 4 is caused to emit light, followed by the rotation angles θ2, θ3, θ4,
Rotates sequentially with θ5, causing the IRED 4 to emit light in the same manner. The output of the PSD 5 based on the light emission is taken into the CPU 10 via the first ratio calculating circuit 11, and the first calculating means calculates the distance measurement value at each subject scanning point and takes it into the memory. In addition, at the position of the rotation angle .theta.3 of the holding frame 6, the detection switch 8 is turned on, and the position detection circuit 8A detects that the holding frame 6 has reached the position where long distance measurement is possible. Then, the subject reflected light at the center of the screen by the distance measuring light of the IRED 4 enters the PSD 7, and its output is taken into the CPU 10 via the second ratio calculation circuit 13, and the distance measurement value of the center subject is calculated by the second calculation means Is calculated and taken into the memory.

Subsequently, the distance measuring data calculated by the first calculating means by the PSD 5 of the detecting unit of the first light receiving means at each point of the above-mentioned rotation angles θ 1 to θ 5 is determined by the determining means of the CPU 10 in a predetermined manner. Perspective determination distance L0, for example, 5.3 m
If there is a data indicating a value of the short distance as compared with the distance data, the closest value among the distance measurement data by the PSD 5 is output as the determined distance value. On the other hand, if any of the distance measurement data by the PSD 5 at each point of the rotation angles θ1 to θ5 indicates a long distance as compared with the predetermined distance determination distance L0, it is the distance measurement system of the second light receiving means. The distance measurement data calculated by the second calculation means by the PSD 7 is output as a fixed distance value.

Here, the relationship between the range that can be measured by the detectors of the above two light receiving means and the accuracy of distance measurement will be described by specifically considering the dimensions that can be used as a camera. That is, the rotating part (the light receiving lens 2 and P
For SD5), the closest distance for focus detection is Lmin = 30.
cm, the base line length s1, which is the distance between the light emitting and receiving lenses 1 and 2, is 1
0 mm and the focal length f1 of the light receiving lens 2 is 10 m
Assuming that m, t1−a1 = 0.33 mm is obtained from equation (6). However, the length a from the end of the PSD to the optical axis position of the light receiving lens and the total length t of the PSD in Equation (6) are obtained by substituting the values a1 and t1 for PSD5, respectively. Considering "blurring" of the light receiving spot, PS
The total length t1 of D5 is about 1 mm.

On the other hand, as a general specification of a camera, a distance measurement range on the long distance side is required to be about 10 m. In this case, the value of s 1 · f 1 / t 1 in the above equation (4) is usually required to be about 350 mm in terms of measurement accuracy. However, it is necessary to compactly hold the holding frame 6 of the rotating portion, and as described above, the base line length s1 is 10 mm,
In the case where the focal length f1 is 10 mm and the total length t of the PSD is 1 mm, it is only s1 · f1 / t1 = 100 mm, and the accuracy is reduced to 1 / 3.5 with respect to distance measurement using a general PSD. . Therefore, in the present embodiment, the distance measurement corresponding to the object longer than the predetermined distance L0 uses the light receiving lens 3 and the PSD 7, which are the detecting units of the second light receiving means, and the reference length s2 is set to be longer than the light projecting lens 1. The PSD 7 is provided at a position 50 mm apart. Assuming that the focal length f2 of the light receiving lens 3 with respect to the PSD 7 is 14 mm and the total length t2 of the PSD 7 is 2 mm, s1 · f1 /
The value of s2.f2 / t2 corresponding to the value of t1 is as follows, and s2.f2 / t2 = 50.14 / 2 = 350 mm. A predetermined resolution can be satisfied.

Further, the present measuring apparatus is designed to measure the short distance with the PSD5 which is the detecting section of the first light receiving means and measure the long distance with the PSD7 which is the detecting section of the second light receiving means. The closest distance Lmin for focus detection by the second light receiving means may be large to some extent. Therefore, if the total distance of the PSD 7 is set to t2 = 1 mm in order to further increase the resolving power by slightly increasing the shortest distance Lmin, the above s1 · f
The resolution twice as high as when 1 / t1 = 350 mm is obtained. In this case, the closest distance Lmin is 2.1 m from the equation (6).

On the other hand, the distance measuring optical system of the rotating portion, which is the detecting portion of the first light receiving means, is reduced to 1 / 3.5 as described above, and the light amount and the accuracy are in a proportional relationship. do it,
The distance measurement can be performed with approximately the same accuracy as the distance measurement optical system when the S / N ratio is s1 · f1 / t1 = 100 mm and the distance measurement optical system when s2 / f2 / t2 = 350 mm. Therefore, when the distance L0 is determined,
The value of s2 / f2 / t2 of the second light receiving means is 350 m
Assuming that the longest distance for distance measurement is 10 m when m is set, L0 = 10 m · (1 / 3.5) ^1/2 = 5.3 m. That is, the distance measurement system of the first light receiving means can measure the distance with the same level of accuracy up to 5.3 m.
In the range of m, photographing can be performed without the occurrence of a hollowing-out phenomenon, regardless of the position of the subject in the screen. Also,
At a distance farther than the above, the frequency of photography of the composition as shown in FIG. 10B can be considered to be statistically low, and the center of the second light receiving means is detected by the distance measuring system. Only the distance measurement can sufficiently cope.

In this embodiment, the in-screen scanning by the rotation of the holding frame is always performed at a fixed number of continuous points. However, in the case of a camera with a zoom lens, this is three points on the telephoto side. Alternatively, the number of points may be switched according to the focal length, such as 9 points on the wide-angle side. Further, the scan range may be changed according to the focal length of the taking lens.

Next, a distance measuring apparatus according to a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, the first
As shown in FIG. 7, a light projecting means and a first light receiving means are built in as shown in FIG.
And the movable spherical holding frame 20 having the light receiving window 20b can be rotated not only in the horizontal direction (θ) but also in the vertical direction (ψ). By rotating the holding frame 20 like a human eye, not only the horizontal distance measuring points 52 but also the vertical distance measuring points 53 as shown in the photographing screen 51 of FIG. The distance measuring point 5 in the diagonal direction is simultaneously rotated in the vertical and vertical directions.
4, 55 distance measurements can be performed. Although the second light receiving means of this embodiment is not shown, the spherical holding frame 2 is not shown.
0 is disposed at a position separated by a predetermined interval on the side facing the front, and it is assumed that a long distance measurement is performed as in the first embodiment.

FIG. 8 shows an example of a driving mechanism of the spherical holding frame 20 of the distance measuring apparatus of the present embodiment. The outer spherical surface of the spherical holding frame 20 has spherical sliding holding members 21a, 21a.
b, 21c and 21d. To rotate the holding frame 20 in all directions as described above, the holding frame 20
This is performed by moving the universal joint 27 supporting the support projection 20b fixed to the left and right (x) and up and down (y).

First, as shown in FIG. 8, the feed screw 23 is rotated by a feed screw 23 coupled to an output shaft of an x drive motor 22 fixed to a camera body (not shown). The corresponding drive base 24 moves in the x direction. A y-drive motor 25 is attached to the drive stand 24,
Further, the rotation of the feed screw 26 coupled to the output shaft of the y drive motor 25 causes the universal joint 27 screwed to the feed screw 26 to move relatively up and down, and as a result, to the camera body. On the other hand, it moves in the x and y directions. The x, y drive motors 22, 25 are C
It is controlled by a PU (not shown), and it becomes more effective if the line of sight of the photographer and the distance measurement point are linked by known line-of-sight tracking means.

[0031]

As described above, the distance measuring apparatus according to the present invention comprises the first light receiving means for measuring a short distance and the first light receiving means for measuring a long distance.
A second light receiving means is provided, and a light receiving means is provided based on the outputs of the two.
Since the object distance is determined, the
Performs ranging over a long distance, has a high effect of preventing hollow holes, and measures distances.
The distance can be adjusted with high accuracy, and the configuration is simple.
It has many remarkable effects.

[Brief description of the drawings]

FIG. 1 is a front view of a camera having a built-in distance measuring device according to a first embodiment of the present invention.

FIG. 2 is a plan view of the camera of FIG. 1;

FIG. 3 is a main configuration diagram of an optical system of the distance measuring device of FIG. 1;

FIG. 4 is a diagram showing a holding frame rotating state of the optical system of the distance measuring device of FIG. 1;

FIG. 5 is a main block configuration diagram of an electric control circuit of the distance measuring device of FIG. 1;

FIG. 6 is a time chart of a distance measuring operation of the distance measuring device of FIG. 1;

FIG. 7 is a perspective view of a spherical holding frame of the distance measuring device according to the second embodiment of the present invention.

FIG. 8 is a view showing a rotating mechanism of a spherical holding frame of the distance measuring device shown in FIG. 7;

FIG. 9 is a view showing each distance measuring point in the screen of the distance measuring device in FIG. 7;

FIG. 10 is a diagram showing each ranging point in a screen of a conventional distance measuring device.

FIG. 11 is a diagram showing a distance measuring beam of the conventional distance measuring device of FIG.

FIG. 12 is an optical path diagram of a three-point distance measuring optical system of the conventional distance measuring device of FIG. 10;

[Explanation of symbols]

1 ... Projecting lens (projecting unit) 2 ... Receiving lens (first receiving unit) 3 ... Receiving lens (second receiving unit) 4 ... ... IRED (light emitting means) 5 PSD (first light receiving means) 6... Rotating holding frame (rotating member) 7... PSD ( (Second light receiving means) 8 position detecting switch (position detecting member) 14 CPU (first calculating means, second calculating means, discriminating circuit) 20... Spherical holding frame (rotating member)

Claims (4)

(57) [Claims] 1. A measurement screen which is rotated to scan a measurement screen.
A short-distance measurement comprising a light projecting means for projecting the distance light, a first light receiving lens for rotating the light projecting means integrally with the light projecting means and receiving an optical signal related to the subject distance, and a first sensor. First light receiving means, and a second light receiving lens and a second sensor which are provided separately from the first light receiving means and receive an optical signal related to a subject distance near a central portion in the measurement screen. A second light-receiving means for measuring a long distance, and a light-emitting direction of the light-emitting means are detected, and light is emitted in a predetermined direction.
And control means for operating the second light receiving means, the first, on the basis of the output of the second light receiving means, and calculating means for determining a definite distance value, which comprises a, and the light emitting means The first light receiving means
The base length is S1, and the base length between the light projecting means and the second light receiving means is S1.
The line length is S2, the focal length of the first light receiving lens is f1,
When the focal length of the second light receiving lens is f2, by satisfying the condition of S1 · f1 <S2 · f2 , compared with the first light receiving unit.
A distance measuring device wherein the distance resolution of the second light receiving means on the long distance side is increased . 2. A light projecting means for projecting distance measuring light to a subject via a light projecting lens, and a first focal length f1 disposed at a position separated from the light projecting lens by a first base line length S1. And a total length t1 for receiving reflected light of the distance measuring light from the subject via the first light receiving lens having the following formula.
A first light receiving unit including a first light receiving sensor, a rotating unit for integrally rotating the light projecting unit and the first light receiving unit, and a second base line length S2 from the light projecting lens. A second light receiving lens which is disposed at a distance and has a second focal length f2, and the second light receiving when the light projecting means projects the distance measuring light in a direction coinciding with a photographing optical axis. Receives the reflected light of the distance measurement light from the subject through a lens
A second light receiving means including a second light receiving sensor having an overall length t2, and a calculating means for determining a fixed distance value based on the outputs of the first and second light receiving means. , S1, S2, f1, f2 , t1,
t2 is a distance measuring device, characterized in that the condition is satisfied in S1 · f1 / t1 <S2 · f2 / t2. 3. A first and a second lens, the first lens disposed at a position separated by a first baseline length S1
A light projecting means for projecting distance measuring light through the
Receives the reflected light from the subject of the distance measurement light via the lens.
First distance measuring means including a first light receiving sensor that emits light; rotating means for rotating the first distance measuring means; and a position separated from the first lens by a second base line length S2. And a third lens fixed to the
The reflected light from a specific point in the screen
A second distance measuring means including a second light receiving sensor for receiving light; and a calculating means for determining a fixed distance value based on outputs of the first and second distance measuring means, The focal length of the second lens is f1,
A distance measuring apparatus characterized by satisfying a condition of S1 · f1 <S2 · f2 when a focal length of the third lens is f2 . 4. A light projecting means capable of projecting distance measuring light so as to scan the inside of a measuring screen, a detecting means detecting a scanning position of the light projecting means, and the measuring means at a plurality of measuring points on the screen. A first light receiving unit that rotates together with the light emitting unit to receive the reflected light of the distance light and outputs a plurality of distance-related signals, and an executable state is detected according to a detection result of the detecting unit. A second light-receiving means for receiving reflected light of the distance-measuring light from a specific point on the screen and outputting a distance-related signal; and a fixed distance based on outputs of the first and second light-receiving means. Calculating means for determining a value, wherein the second light receiving means is more than the first light receiving means.
Distance resolution on the far side is set high,
The calculating means determines that each distance output of the first light receiving means is a predetermined distance.
When the distance is longer than the distance determination distance value, the second
The distance output of the light receiving means should be determined as the final distance value.
And a distance measuring device.