JPS63104043A - Image input device - Google Patents

Abstract

PURPOSE:To limit the titled device so that, for instance, the focal length of a lens does not exceed a short distance photographing area, by constituting said device so that a direction detecting means detects whether the photographing direction of a camera part is a direction of an original placing table or not, and in case of the direction of the original placing table, a control means controls a movable range of a distance adjusting mechanism of the camera part. CONSTITUTION:The titled device is provided with a direction detecting means SW4 for detecting whether the photographing direction of a camera part is a direction of an original placing table or not, and a control means for controlling a movable range of a distance adjusting mechanism of the camera part in accordance with this direction detecting means SW4. The switch SW4 is a direction detecting means which does not conduct in case when the camera part is directed forward, and conducts in case when it is directed downward, and a cam 102a allows the SW4 to conduct, when the camera part is directed toward the original placing table. In this way, in case when the camera part is directed onto the original placing table and photographing is executed, it can be limited so that the focal length of a lens does not exceed a short distance photographing area, therefore, the operability is improved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an 1t1η image input device.

[Conventional technology]

4th and 1 are diagrams showing the photographing direction of the camera section of the dual-image input device, and Figure 1a is a photograph of the document facing direction (downward); The photograph is taken in the direction (forward direction).

In FIG. 4, 101 is a document table on which the subject is placed;
Reference numeral 2 designates an arm that provides a camera section in a space above the central position of the document table; reference numeral 103 indicates a camera section that provides the closest shadow to the subject; and reference numeral 104 indicates a lens that adjusts the focal distance with the subject. Further, in the figure, 105 is a blackboard indicating the subject.

ffl J,! In the case of 2, the camera is fixed in the direction of the camera, and depending on the distance between the camera and the subject, the lens ring of the camera is turned to adjust the focal length and the photograph is taken.

On the other hand, when photographing a relatively large or heavy object that cannot be placed on the manuscript table on another table, or when photographing a subject or scenery on a manuscript board set up on a blackboard or wall, from the direction of the manuscript table. When photographing a subject that is far away, rotate the camera unit to point in the direction of the subject, and then turn the distance ring on the lens of the camera unit to adjust the focus from close range to infinity. Take pictures at close range.

[Problem that the invention attempts to solve]

However, when photographing a subject on the document table, it is not necessary for the lens' shooting distance range to reach infinity, or the focal length of the lens is close, especially if the distance ring of the lens is driven by a motor. In some cases, the range exceeded the distance shooting range. Therefore, in such a case, it is necessary to correct the problem by rotating the ILF motor in the opposite direction.
In terms of operation, there were problems in that it took -T-11 and took more time than necessary.

An object of the present invention is to provide an image input device that solves the above problems.

(Means for Solving the Problems) The image input device of the present invention includes a direction detecting means for detecting whether the photographing direction of the camera section is toward the document table or h, and a 01 of the distance adjustment mechanism
It is equipped with a control means for controlling the range of motion.

(Function) The direction detecting means detects whether the photographing direction of the camera section is in the direction of the original combined force, and if it is in the direction of the document table, the control means controls the movable cylinder pfl of the distance 1i1ff adjustment mechanism of the camera section. However, for example, the focal length of the lens is limited so that it does not exceed the short distance m photographing area.

〔Example〕

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a diagram showing the state of SW4 when the camera section is facing downward.
Also, FIG. 3 shows SW4 when the camera section is facing +irf.
[A] indicates the state of [A].

Further, detailed explanation of the components having the same number as number 5) shown in the conventional example item will be omitted.

In FIGS. 2 and 3, 104a is a switch contact surface that conducts from the closest distance of the lens 104 to the imaging area at infinity f/li distance, and 104b is a switch that conducts from the closest distance to the document table surface. On the contact surface, SW4 is a switch that is energized when the camera section is facing toward the document table 101, 102a is a cam that conducts the SW4 when the camera section is facing toward the document table 101, and 104d is a switch from the above-mentioned 104a and 104b. A contact piece 104c that conducts the current to the ground line is a ground line that electrically collects the current in one place.

As described above, 104a and 104d constitute the switch SW2 in the TfJ1 diagram. Further, 104b and 104d constitute the switch SW3 in FIG. 1.

In FIG. 1, SWI is the distance a11 ring drive motor 27
This is a switch that gives instructions for forward and reverse rotation, where a is forward rotation (direction in which the lens is pulled in from a near distance direction to infinity and focused), C is reverse rotation (direction in which the lens is extended), and b
indicates a stop.

SW2 is a switch that conducts in the most shadow area from the closest distance to the infinite distance 2 of the lens (not shown), and is a switch that conducts in the most shadowed area of the lens (not shown).
There is no conduction at the point beyond the shadow @ area.

SW3 is a switch that serves as an area detection means that conducts from the closest distance to the short distance shooting area of the lens (not shown).
There is no conduction at the point beyond the mf X shadow area. SW4 is non-conductive when the camera unit (not shown) is facing 1111,
This is a switch that serves as a direction detection means that conducts when the direction is downward. R1-5 are the switches 5W1a, lb, 5W
2-4 is a resistor that controls the current by 1tIII when conductive.

1 to 5 are inverters that invert the L level signal generated when the fermentation switches SW1 to SW4 are conductive to an H level signal;
6 is an AND circuit that generates an H level output when the input from the inverter 1 described in iif and the human power from the OR circuit 15 (described later) is at the H level; 7 is the AND circuit that generates an output of H level when the input from the inverter 1 described in iif and the human power from the OR circuit 15 (described later); 9 is an AND circuit that generates an H level output when the human power is H level;
One of the D circuits 6 and 7 is an OR circuit that outputs an H level if there is an H level human power, R6 and R8 are resistors that limit the current, and 24 and 25 are an OR circuit that outputs an H level from the OR circuit 8. When ONI occurs, the transistor drives the motor 27 in the forward rotation direction, and 9 and 11 are OR transistors, which will be described later.
An inverter that inverts the output from the circuit 15, 10 is a N A N 0 circuit that outputs an L level only when the outputs from the inverter 2 and the inverter 9 are both at an H level, 1
2 is a set/reset flip-flop (
R5-FF).

13 is an AND circuit that generates an H level output from the inverter 3 and SW4 when the human power is at the H level, and 14 is an AND circuit that generates an H level output from the inverter 4 and the inverter 5 when the human power is at the H level.
AND circuit that generates level output, 15 is 1 above AND
This is an OR circuit that generates an H level output when an H level is manually input from either the circuit 13 or the AND circuit 14.
1) “AND circuit 13, AND circuit 14, and OR circuit 1
5 constitutes a motor stopping means.

16 is the human power from the inverter 2 and the OR circuit 1 if
17 is an AND circuit that generates an H level output when the human power from the inverter 2 and the human power from R5-FF22, which will be described later, is at the level . , 18 indicates that the human power from either the AND circuit 16 or the AND circuit 17 is H.
OR circuit that generates an H level output when the level is high, R7
and R9 are resistors that limit the current, 23 and 26 are transistors that turn on when the +'6r OR circuit 18 generates an H level output to drive the motor 27 in reverse rotation, and 19 and 21 are 1
An inverter 20 is an inverter that inverts the human power from the OR circuit. A NAND circuit 20 is an NAND circuit that generates an L level output only when the human power from the inverter 1 and the inverter 19 are at an H level. This is a set/reset flip-flop (R3-FF) that generates an H level output from Q when the L level from S is applied to the S human power.The distance ring between the motor 27 and the lens is linked to Oguni 7r. It is linked by a mechanism.

R6 to R9 are resistors that limit the current; 24 and 25 are transistors that drive a motor 27 (described later) in the forward rotation direction;
Reference numerals 3 and 26 designate transistors that drive the motor 27 in the reverse rotation direction; 2 and 2 designate a motor that drives the m ring of the lens (not shown) in the forward and reverse directions; and 29, a power source.

In the above configuration, the operation will be explained.

(a) When photographing is performed by switching the photographing direction of the camera section from the document table to a relatively distant blackboard or the like as shown in FIG. 4, SW4 is turned OFF. Since the lens was within the short distance range, SW2 and SW3 are in the ON state. Also, in order to focus the lens, it is necessary to retract it to the infinity side, so 5W1a is turned on. Then, L level is applied to inverters 1, 3, and 4, and an H level output is generated. Also, inverters 2 and 5
Since an H level is applied to , an L level output is generated. Since the AND circuit 13 is powered by two people at H level,
It generates an H level output and inputs it to the OR circuit 15.

The OR circuit 15 also generates an H level output, and each AN
The output is transmitted to D circuit 6, inverter 9, inverter 11, AND circuit 16, inverter 19, and inverter 21. The AND circuit 6 generates an H level output from the H level from the inverter 1 and the H level from the OR circuit 15, and
Inform circuit 8. Therefore, an H level output is generated from the OR circuit 8, and the H level output is transmitted to the transistors 24 and 25 via the resistors R6 and R8, and the transistors 24 and 25 are turned on. Therefore, transistors 24 and 2
A current flows through 5.

On the other hand, since the L level from the inverter 2 is applied to one of the inputs of the AND circuit 16, the output is at the L level. Since the L level from the inverter 2 is also applied to the human power of the AND circuit 17, the output is at the L level, so the output from the AND circuit 16 and 17 is
The output of the R circuit 18 is also at L level. Therefore, l.
Since transistors 23 and 26 are in the OFF state, no current flows.

From the above, when 5W1a is ON, the motor 27 rotates in the forward direction and drives the distance ring.

At this time, R5-FF22 is in a state where the Q output is generating L level because the L level output from the inverter 21 is being applied to the 8-power.

The distance ring then rotates and the lens is drawn from near distance to infinity.

If you rotate the noodle ring to a certain extent -j-, the lens will be at close range n.
Since the object is out of the photographing area, SW3 is turned OFF.

Then, since H level is applied to inverter 4, L
Output the level. The output is then transmitted to the AND circuit 14, but since the L level is also transmitted to the other human power of the AND circuit 1h, the output does not change, and therefore the state of tiif is maintained, so the motor 27 does not rotate. continue.

Next, when the lens enters the infinity shooting range and the focal length of the lens reaches "infinity", SW2 is also turned off. 1-
Then, since the H level is applied to the inverter 3, the L
It outputs the level and transmits the L level to the AND circuit 13.

Therefore, AND circuit [3] generates L level and transmits it to OR circuit 15, but since the output of AND circuit 14 is also already at L level, the output from OR circuit 15 becomes L level. This L level is determined by AND circuits 6 and 16, respectively.
and 17, are transmitted to inverters 9, 11, 19, and 21,
Each inverter 9, 11, 19, and 21 generates an H level output. AND circuit 16! 7, 1) t "As mentioned above, since the L level output from the inverter 2 is applied, the output is also at the L level, so the output of the OR circuit 18 is at the L level, and the previous Does not change from state.

However, since the NAND circuit 20 receives the H level from the inverter 1 and the H level from the inverter 19, it generates an L level output -.

On the other hand, since the inverter 21 is outputting the H level, the R3-FF 22 generates the H level from the Q output.

On the other hand, since the L level from the OR circuit 15 is applied to the AND circuit 6, the output is at the L level. And N
The output of the AND circuit 10 is the L level from the inverter 2 and the L level from the inverter 9, and generates an H level. In addition, since the inverter 11 also generates an H level, both the S input and the R input of R5-FF12 become H level, and the Q output is L level because the state of m is maintained. 7 also becomes L level output,
If the output of OR circuit 8 changes to the level, transistor 2
Turn off 4 and 25. Therefore, no current flows through the motor 27.

As a result of the above, even when the motor 27 rotates in the forward direction, when the focal length of the lens reaches "infinity", S W 2 h) O
FF nitt''C, the motor 27 stops.

(b) The IWt shadow direction of the camera section is the same as (a) in the above section, and when rotating the motor in the opposite direction,
The position of each switch at the time when stops is 5W1a
ON, SW2-4 OFF. Next, switch SW
Switch I from a to C. Then, L is applied to inverter 2.
The level is manually adjusted and outputs H level. The other inverters 1, 3, 4, and 5 are manually input with H level and output L level. Since the output of inverter 1 is at L level, AND circuits 6 and 7 output L level.
OR circuit 8 also outputs L level. Therefore, transistors 24 and 25 remain OFF. Inverter 3
, 4 and 5 are outputting L level, AND circuit 1
3 and 14 are L level outputs. Therefore, the OR circuit 15 is also in an L level output state. NAND circuit 2
0, the L level from the inverter 1 and the H level from the inverter 19 are input manually, so the H level is generated as an output. Furthermore, since the inverter 21 is also generating H level, R3-FF22 maintains the previous state, so the Q output becomes H level and is sent to the AND circuit 17.

Since the H level from the inverter 2 is also applied to the AND circuit 17, the OR circuit 18 is caused to output the H level. Therefore, the transistors 23 and 26 are ONL, allowing current to flow 1-0, so that the motor 27 rotates in the reverse direction.

As a result of the above, by switching SWl to the C side, the motor 27 rotates in the reverse direction.

When the motor 27 rotates in the reverse direction, SW2 is turned on again to switch the output of the inverter 3 from L level to H level.

Since SW4 is OFF in the AND circuit 13, H level is applied to one human power, and H level of inverter 3 is applied to the other.
Since the level output is applied, the output becomes H level,
The output of the OR circuit 15 is switched from L level to H level.

Since the output of the -r inverter 1 is at the L level, the AND circuits 6 and 7 each generate an L level output, and therefore the output of the OR circuit 8 also remains at the L level. Also, at this time, since H level is applied to the S-man power of R3-FF12 and L level to the 8-man power, the output of R5-FF12 becomes L level. AND circuit 16 is inverter 2
The H level from is also applied, and the output is switched to H level. Then, R5-FF22 has the S power from the NAND circuit 20 at H level, and the 8 power from the inverter 21 at L level.
Therefore, the Q output switches from the H level to the L level, and the output of the AND circuit 17 becomes the L level. Therefore, since the OR circuit 18 generates an H level output by the H level input from the AND circuit 16, the transistors 23 and 26 are turned on and current flows. Therefore, the motor 27 continues to rotate in reverse.

Further, when the motor 27 continues to rotate in the reverse direction, SW3 is also turned on, but since there is no change in the output of the other gate circuits except for the inverter 4, the motor 27 continues to rotate.

Then, as the motor 27 roughly continues to rotate in reverse, the lens is extended beyond the 11th closest photographing area to the "closest photographable distance" and SW2 and SW3 are turned OFF again. At that time, since the output of the inverter l is at L level, the outputs of AND circuits 6 and 7 and OR circuit 8 are also at L level, as described in n1f. Therefore, transistors 24 and 25 are OFF. On the other hand, R5-FF12 is S
Since the L level is applied to the human power, the Q output is switched to the H level. Also, the outputs of inverters 3, 4, and 5 are L
Since the level is switched to L level, the output of the OR circuit 15 is also switched to L level. Then, the output of the AND circuit 16 is also switched to the L level. The other human power on the NANDM path 20 is switched to the H level via the inverter 19, or there is no change in the H level of the output. R3-FF22's 8-person power is inverter 21
However, in order to maintain the previous state, the Q output switches to L level. Therefore, the AND circuit 17 also switches to L level, and the OR circuit 18 also switches to L level. Therefore, transistors 23 and 26 are
It becomes FF and no current flows.

From the above 1-, when the lens is extended to the "closest distance capable of photographing", the transistors 23 to 26 are turned off and the motor 27 is stopped.

(c) When switching the Ivt shadow direction of the camera unit to the direction of 11 units, SW4 turns ON. Therefore, the state of each switch is SW1c and SW4 are ON, SW2 and SW3 are OFF.
It is FF.

Then, when SWI is switched to the a side again, the outputs of inverters 1 and 5 are switched to H level, and the outputs of inverters 2, 3, and 4 do not change. Therefore, AND circuits 13 and 14
Since the output is at L level, the output of OR circuit 15 is also at L level. Furthermore, since the outputs of AND circuits 16 and 17 are also at L level, OR circuit 18 outputs L level. However, since transistors 23 and 26 are OFF, no current flows.

On the other hand, since the L level human power from the inverter 2 and the H level human power from the inverter 9 are applied to the NXND1 path 10, an H level output is generated. Also, R5-FF1
The H level from the inverter 11 is applied to the 8-man power supply of 2, but in order to maintain this state, the Q output is in the H level state. Therefore, the AND circuit 7 connects the inverter 1
The output is switched to H level by the H level from R3-FF12 and the H level from R3-FF12, and the OR circuit 8 generates an H level output. Therefore, the transistors 24 and 25 turn ON and current flows, causing the motor 27 to rotate in the forward direction.

When the motor 27 continues to rotate forward, SW2 and SW3 are turned ON again. At this time, the AND circuit 14 receives the H level input from the inverters 4 and 5 and switches the output of the OR circuit 15 to 1 level in order to generate an H level output.

Then, it is transmitted to each inverter 9, 11, 19, and 21,
Generates L level output.

An H level output is generated in the NAND circuit 12 by the L level input from the inverters 2 and 9. Since inverter 11 is at L level, R3-FF12
is switched to L level, and the output of AND circuit 7 is switched to L level. However, since the AND circuit 6 receives the H level human power from the inverter 1 and the H level human power from the OR circuit 15, the output is switched to H level and is transmitted to the OR circuit 8.

On the other hand, AND circuits 16 and 17
Since they are receiving level human power, both outputs are at L level, and the output of the OR circuit 18 is also at L level. Therefore, transistors 23 and 26 are OFF.

Next, the moment the motor 27 continues to rotate in the forward direction and passes beyond the close-range photographing area, SW3 is turned OFF. Then, inverters 1, 3, and 5 output H level, and inverters 2 and 4 output L level.
Output the level. Since the inverter 2 outputs the output level, the output of the OR circuit 18 is also at the L level, as described above.

Therefore, transistors 23 and 26 remain in an OFF state.

Since SW4 is ONL, the AND circuit 13 receives an L level of human power, and outputs an L level. Further, since the AND circuit 14 receives the L level human power from the inverter 4, the output is at the L level. Therefore, the output of the OR circuit 15 is switched to L level, and the outputs of each inverter 9, 11, 19, and 21 are also switched to H level. .

The AND circuit 6 switches the output to the L level due to the L level input from the OR circuit 15. And NAND circuit 1
0 is the H level output from the inverter 2 and the H level human power from the inverter 9. R
5-FF12 receives the H level input from the inverter 11 on the R side, but in order to maintain that state, the Q output is L.
become the level.

Therefore, the AND circuit 7 also outputs an L level,
[Turn off transistors 24 and 25.

As described above, the motor 27 stops.

Furthermore, when SW2, SW3, and SW4 are in any state, when SWI is set to the b side, the output of inverter 1 becomes L level, and the outputs of AND circuits 6 and 7 are switched to L level. Therefore, the output of the OR circuit 8 is also switched to L, and the transistors 24 and 25 are turned off. The output of the inverter 2 also becomes L level, and the outputs of the A N D circuits 16 and 17 are switched to L level. 1) Therefore, the output of the OR circuit 18 is also switched to L level, and the transistors 23 and 26 are also turned off.

As shown below, when SWI is switched to b side, motor 27
stops F.

As described above, by detecting the photographing direction of the camera section with the direction detection r1 stage, when the area detecting means detects when the photographing direction exceeds the close-range photographing area, the motor stopping means operates to stop the motor. In addition, in the above-mentioned embodiment, the motor is of the power focus type in which the forward and reverse rotations are manually switched, but the SWI is abolished and the input signals for inverters 1 and 2 are obtained from the autofocus control circuit. Of course, it is also possible to perform the same operation in such cases.

Furthermore, the present invention is not limited to power focus and autofocus; for example, in the case where the distance ring of the lens is directly moved manually, it goes without saying that the range of movement may be manually limited depending on the orientation of the lens. .

(Effects) According to the present invention, for example, when photographing with the camera unit facing the document table, the focal length of the lens can be restricted so that it does not exceed the short-distance photographing area, improving operability. do.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a specific circuit as an embodiment of the present invention, FIG. 2 is a diagram showing the state of SW4 when the camera section is facing downward, and FIG. 3 is a diagram showing the state of SW4 when the camera section is 11!1. FIG. 4 shows the photographing direction of the camera unit [A, a) is a downward view, and b) is a planar view. SW3... Area detection means SW 4-... Direction detection means 13.14-... AND circuit (motor stop means)
15...OR circuit (motor stop F stage) camera section is lower fEI-! Figure 2 shows the four missing attacks of SW4 in the case of land exchange.

Claims (2)

[Claims] (1) Direction detection means for detecting whether or not the photographing direction of the camera section is in the document alignment direction, and a control means for controlling the movable range of the distance adjustment mechanism of the camera section according to the detection direction means. An image input device characterized by: (2) The control means is a control means for controlling only the short distance side of the distance adjustment mechanism to a movable range when the direction detection means detects that the photographing direction of the camera section is toward the document table. An image input device according to claim 1, characterized in that: