JPS60118817A - Electrically driven revolver device for selecting objective - Google Patents

Abstract

PURPOSE:To simplify operation and to improve efficiency by constituting a titled device in such a way that a signal for stoppering a revolver is inputted to a device for driving said revolver when the setting of the objective of an assigned mount into an optical path is decided. CONSTITUTION:A magnetic mark 22 consisting of three bits is formed on the outside circumferential surface of a revolver 1. Hall elements 23 of three bits are provided to a mirror base 20 in accordance with said marks 22 and this state is made correspondent with an objective 21. A microcomputer 24 inputs a rotating signal to a driving circuit 30 when the state of the element 23 and the value assigned by a switch 27 for assigning the objective do not coincide with each other. When the microcomputer 24 decides the coincidence of the objective 21 in the optical path and the assigned objective, said computer detains the output of the rotation signal. The assigned objective 21 is thus set in the optical path. The operation is simplified and the efficiency is improved by the above-mentioned constitution.

Description

Detailed Description of the Invention (Technical Field of the Invention) The present invention provides a system for selecting an objective lens by electrically rotating a revolver equipped with a plurality of objective lenses.
ll revolver device, for example,
It can be used for one tablet.

(Background of the Invention) In conventional microscopes, a so-called electric revolver device is known in which an objective lens selection revolver is rotationally driven by a motor to select an objective lens.

However, with such conventional electric revolver devices,
Once the right or left rotation switch was turned on, the revolver rotated so that the objective lens adjacent to the right or left was inserted into the optical path. Since the operator must confirm whether or not the lens is inserted into the optical path, the operation is complicated and inefficient.

(Object of the invention) The object of the present invention is to solve these drawbacks and provide a device that can automatically set a target objective and lens in the optical path.

(Summary of the Invention) FIG. 1 is a diagram corresponding to the clay frame of the present invention, and shows a revolver having a plurality of mounts for mounting a plurality of objective lenses and identification means corresponding to each of the plurality of mounts. 1 and a motor means 2 for rotating the revolver 1
and a drive unit W6 that controls rotation and stop of the motor means 2.
and an identification signal output means 4 for outputting a signal corresponding to the mount of the revolver 1 equipped with the objective lens set in the optical path of the apparatus main body by detecting the identification means, and the revolver 1. designation means 5 which can designate any mount among the mounts and outputs a signal corresponding to the designated mount; and identification signal output means 4. and a direction indicating means 6 which determines the shortest rotation direction from the output signal of the specifying means 5 and inputs a signal instructing the rotation direction of the revolver 1 to the drive device 6 (output signals of the identification signal output means 4 and the instruction means 5). and determining means 7 for determining whether the objective lens of the designated mount is set in the optical path, and inputting a signal to the driving device to stop the revolver.

(Embodiment) FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 5 is a flowchart of the microcomputer used in FIG.

The mirror base 20 of the microscope has an illumination optical system (not shown), etc.
A revolver 1 for exchanging a blade lens 21 is rotatably provided. The revolver 1 has a mount (for example, female thread) for attaching multiple objective lenses:
have In FIG. 2, for the sake of simplicity, only the objective lens 21 along the observation optical axis is shown. On the outer peripheral surface of the revolver 1, there are 3'-bit magnetic marks 22 corresponding to each mount.
is formed.

It is possible to identify eight types of objective lenses using 6-bit magnetic marks. The magnetic mark 22 is formed by embedding small magnets in required locations (
The black part is the magnet), A-A in Figure 2
As shown in FIG. 6, which is a schematic diagram in the direction of arrows, when an arbitrary objective lens 21 is brought along the observation optical axis, the magnetic mark 22
6-bit Hall elements 23a, 23 as shown in FIG.
b, 23C is provided on the chain thread 20. In the case of FIG. 6, Hall elements 23a and 23b detect magnetism and turn on, and Hall element 23C turns off. The states of the Hall elements 23a, 23b, and 23C are made to correspond to the objective lens 21. Note that the Hall elements 23a, 23b, 23c
The combination of turning on and off only needs to have a one-to-one correspondence with the objective lens, so the combination can be selected arbitrarily. Hall elements 23a, 23b,
The on/off state of the magnetic detector 26 consisting of 23C is input to the microcomputer 24. revolver
A motor 25 for rotating the revolver 1 is provided inside the chain string 20, and the rotation of the motor 25 is transmitted by a belt 26 to a member 1' integrated with the revolver 1. The objective designation switch 27 is a switch that designates one of the objective lenses attached to the revolver, and for example, the magnification (5x, 10x,
Double, 20 times.

50 (1'J), and a digital signal corresponding to the pressed switch is input to the microcomputer 24.

On the other hand, the revolver 1 has click recesses 1a, 1b, 'lc, and 1d corresponding to the mounts (in the case of four mounts). A click ball 29 biased from 20 by a spring 28 is depressed.

The objective lens 21 is set so as to be aligned with the observation optical axis when the click ball 29 falls into the recesses 1a to 1d. The positioning structure using such a lick is the same as that of a well-known microscope.

The microcomputer 24 controls the direction of rotation of the motor 25 (
A signal instructing rotation (clockwise rotation, counterclockwise rotation) and a rotation signal instructing the start of rotation are input to the drive circuit 60. The rotation signal is also input to the timer circuit 61. The drive circuit 60 controls the rotation of the motor 25 based on a signal instructing the rotation direction of the motor 25. The load current of the motor 25 is detected by a load current detection circuit 62. The waveform shaping circuit 33 performs threshold processing on the output signal of the load current detection circuit 62 at a predetermined level to shape the waveform. On the other hand, as will be described later, the timer circuit 61 operates so that after the rotation signal is output, the click ball 29 is connected to the mountain (which forms the recess of the revolver 1).
For example, a time-up signal (H level signal) is output as soon as possible after a sufficient time has elapsed to run over the vehicle 1a') in FIG. The AND gate 64 inputs the output signal of the waveform shaping circuit 66 when the time-up signal is generated to the pulse generating circuit 65. A stop signal generation circuit (flip-flop) 66 is set by the signal from the pulse generation circuit 35 and outputs a stop signal, and the drive circuit 60
is input into the microcomputer 24. The drive circuit 60 stops supplying current to the motor 8 when the stop signal generation circuit 66 is set. In addition, the stop signal generation circuit 6
6 is reset by a rotation signal from the microcomputer 24.

On the other hand, after the stop signal generation circuit 66 is set, the microcomputer 24 detects the Hall element 23a after a necessary and sufficient time for the click ball 29 to fall into the recess.
Read the status of 23b and 2roC.

The microcomputer 24 includes, for example, a Hall element 23a.
, 23b, 23C and the value designated by the objective designation switch 27, and if they do not match, a rotation signal is input to the drive circuit 60. Drive circuit 30
As already mentioned, the motor 25 is rotated in the direction of rotation instructed by the microcomputer 24. In this way, when the microcomputer 24 indirectly determines from the state of the Hall element and the specified value that the objective lens in the optical path and the designated objective lens match, the microcomputer 24 outputs a rotation signal. Since there is no output, the motor 25 remains stopped.

Next, the operation of the above circuit will be described in detail with reference to the flowchart of the microcomputer 24 shown in FIG. 5 and the time chart of FIG. 6.

When the magnification of the objective lens is newly designated to the objective designation switch 27, the microcomputer 24 controls the revolver 1.
It is determined whether or not it is rotating (step 51 in FIG. 5).

Specifically, whether or not the revolver 1 is rotating is determined by whether the stop signal generating circuit 66 is set or not. When the revolver 1 is stopped, the states of the Hall elements 26a, 23b, 23c and the objective designation switch 2 are
The rotational direction of the motor 25 and the number of clicks are determined from the values specified in step 7 (step 52 in FIG. 5). The direction of rotation of the motor 25 and the number of clicks are determined by, for example, determining the engagement state of the Hall elements 23a, 23b, and 25c with respect to the value specified by the objective designation switch 27, and
In each case, a correspondence is created by making a one-to-one correspondence between the rotational direction of the motor 25 and the number of clicks, and this correspondence is stored in a memory circuit, and the value designated by the objective designation switch 27 and the hole are stored. The configuration may be such that the rotational direction and the number of clicks of the motor 25 are read out in one-to-one correspondence from the states of the elements 23a, 2-2, and 23C.

When the rotation direction and number of clicks of the motor 25 are determined in this way, the microcomputer 24 outputs the clockwise rotation command terminal P1 or the left rotation command terminal P2 of the drive circuit 60.
After inputting a command signal to (step 56), a rotation signal is input to the drive circuit 60, timer circuit 61, and stop signal generation circuit 66 (step 54). the result,
The drive circuit 6o operates as shown in the time chart of FIG. Figure 6 (a) shows revolver 1 and click ball 29.
FIG. 1 is a diagram schematically showing the relationship 1, and for the sake of explanation, consider a state in which the click ball 29 falls into the recess 1a of the revolver 1. When the microcomputer 24 instructs the motor 25 to rotate to the left, the drive circuit 60 causes the motor 25 to rotate to the left. Thereby,
The revolver 1, which is coupled to the rotating shaft of the motor 25 via a belt 26, also rotates to the left.

Explaining this with reference to FIG. 6(a), if the revolver 1 is fixed, this is equivalent to moving the click ball 29 to the right. Since a large load current flows through the motor 25 due to the pressing force of the click ball 29 when the click ball 29 escapes from the recess 1a, the output signal of the load current detection circuit 62 increases as shown in FIG. 6(b). When the click ball 29 comes out of the recess 1a, the load on the motor 25 becomes relatively small and stable. and click ball 2
When 9 climbs the mountain 1b/ in front of forming the recess 1b, the load increases, so the output signal of the load current detection circuit 62 increases. The load on the motor 25 decreases when it falls into the recess 1b. The click ball 29 further moves into the recess 1b
Considering the case where the motor 25 attempts to run over the mountain 1b' forming the peak 1b', a large load current flows through the motor 25 again, so the output signal of the load current detection circuit 32 increases as shown by the chain line in FIG. 6(b). do. Therefore, the load current detection circuit 6
The output signal of the waveform shaping circuit 63 that thresholds the output signal of No. 2 at a predetermined level Vvef is as shown in FIG. 6(c). That is, from the waveform shaping circuit 66, the click ball 2
A signal is obtained when the revolver 9 climbs the mountain 1b' in front of the recess of the revolver 1, and at the foundation on which it runs over the mountain in order to escape from the recess. The timer circuit 31 is connected to the motor 25
V29 outputs a time-up signal (H level) after a sufficient time for it to escape from the initial concavity 1a (as shown in Fig. 6) after it starts rotating (after the rotation signal is input). The AND gate 4 first outputs a signal obtained when the click ball 29 climbs the mountain 1b' in front of the recess 1b, as shown in FIG. 6(E). This signal becomes a signal indicating that the revolver 1 has rotated a predetermined 51 times. The top of the mountain forming the recess of revolver 1 is shown in Figure 6 (a).

(b) Load current detection circuit 6 as shown by arrow M between
Since this corresponds to the peak of the output signal 2, the fall of the signal in FIG. It shows. The pulse generating circuit 65 and the stop signal generating circuit 66 generate a stop signal for stopping the current supply to the motor 25 at this falling edge. That is, the stop signal generation circuit 66 outputs a pulse of a predetermined time width (FIG. 6 (E)) when the output signal of the AND gate 64 (FIG. 6 (E)) goes low. , set by this pulse. Drive circuit 3
0 cuts off the current supply to the motor 25 by setting the stop signal generation circuit 66. Therefore, the motor 25 rotates only by inertia, and the click ball 29 naturally falls into the recess 1b of the revolver 1 due to the rotation of the motor 25 due to inertia and the biasing force of the spring 28, and becomes stable in the depressed state. do.

Now, when the drive circuit 60 cuts off the current supply to the motor 25 as described above, the microcomputer 24 identifies that moment as a stop signal.Step 55), Step 52
The same operation is repeated until the number of clicks matches the number of clicks determined in (step 56).

When the number of stop signals and the determined number of clicks match, it is determined whether the target objective lens designated by the objective designation switch and the objective lens in the optical path are in direct contact with each other (step 57), and if they match, If it does, it will end.

Further, if they do not match, a warning is issued (step 5).

In this way, the operator can automatically bring the desired objective lens into the optical path, for example, by simply indicating the magnification of the objective lens.

As mentioned above, for example, if you want to automatically set an objective lens of any magnification in the optical path, make each mount correspond one-to-one to the magnification of the objective lens, and when attaching the objective lens to the mount, is not set automatically unless it is attached to the corresponding mount, but since the objective lens is not attached or detached very often, there is almost no problem in practice.

In the implementation described above, a 6-bit magnet was used as the identification means, and a 6-bit Hall element was used as the identification signal output means, but the number of bits of the magnet and Hall element can be selected depending on the number of mounts. can. In addition to magnets, other known means for identifying each mount can be used as the identification means, such as an optically readable code plate or a reflector with high reflectance. In that case, the selected identification means can be used. It is sufficient to provide means for outputting an identification signal that can be detected.

Furthermore, in the above embodiment, in order to read the state of the magnetic detector 26 after the objective lens is accurately set in the optical path, the stop signal generation circuit 66 is set when the revolver 1 is stopped, that is, the stop signal generation circuit 66 is set. After that, click ball 2
The state of the magnetic detector 26 is read after a necessary and sufficient time for the magnetic detector 9 to fall into the recess (step 51.5).
7) It is also possible to mechanically detect the fall of the click ball 29 using a microswitch or the like.

Furthermore, in the flowchart of FIG.
Instead of determining that the designated objective lens is set in the optical path because the number of clicks determined in step 2 is equal to the number of times the stop signal generating circuit 66 is set from υ set after the revolver 1 starts rotating. Each time a stop signal is detected in step 55, the state of the magnetic detector 23 and the specified value may be made to correspond. Furthermore, if the magnification of the objective lens attached to the revolver mount is always uniquely determined, it may be possible to provide the objective lens with a means for identifying the magnification (for example, a magnet), but as mentioned above, It is better to provide the identifier 49 on the revolver.
It is preferable that a conventional objective lens can be used as is.

The electric revolver device as described in the above embodiments can be used in a microscope, a projector, etc.

(Effects of the Invention) As described in 2 below, according to the present invention, there is not only the advantage that the revolver can be rotated to a designated position with one designated operation, but also the stop circuit can be erroneously activated due to noise or the like. This can be expected to have the effect of automatically determining whether there is a mistake in the situation and automatically rotating the revolver to the correct position.

[Brief explanation of drawings]

Fig. 1 is a frame correspondence diagram of the present invention, Fig. 2 is a block diagram of an embodiment of the present invention, Fig. 6 is a schematic view taken along the arrow A-A in Fig. 2, and Fig. 4 is a diagram showing the positioning of the revolver. FIG. 5 is a flowchart of the microcomputer shown in FIG. 2, and FIG. 6 is a time chart for explaining rotation control of the revolver. (Explanation of symbols of main parts) 1... Revolver-122... Curved magnetic mark, 2
3... Magnetic detector, 24... Micro combinator, 25... Motor 27, song/object designation switch, 60... Drive circuit. Applicant Nippon Kogaku Kogyo Co., Ltd. Agent Takashi Watanabe Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A revolver having a plurality of mounts for mounting a plurality of objective lenses and identification means corresponding to each of the plurality of mounts, a motor means for rotating the revolver, and rotation of the motor means. , a drive device that controls stopping, and an identification signal output that outputs a signal corresponding to a mount of the revolver that is equipped with an objective lens set in the optical path of the device body by detecting the identification means. a means for specifying any mount of the revolver and outputting a signal corresponding to the specified mount; a direction indicating means for determining the direction and inputting a signal instructing the rotating direction of the revolver to the driving device, and an objective lens of a mount designated from the output signals of the identification signal output means and the specifying means, in the optical path. 1. An electric revolver for selecting an objective lens; determining means for determining that the revolver has been turned, and inputting a signal to the driving device to stop the revolver; .