SU901874A1 - Device for optical part automatic centering - Google Patents

Description

(54) DEVICE FOR AUTOMATIC CENTERING OF OPTICAL DETAILS

I

The invention relates to the optico-mechanical industry, in the watch industry to the optical production of pincers, and can be used to automatically center the lenses in small-scale and mass production.

A high-quality centering of the optical axis of the face relative to its axis of rotation is necessary for any optical cHCTOvibi and improves the quality indicators of optics.

Cartridges are known for centering lenses in Cl mandrels.

In serial production, for the purpose of precise centering of the optical axes of the lenses, the frame in which the centered lens is attached is brought to a standstill, and sequential operations of combining the optical axis of the lens with the axis of rotation ensure the fixation of the said frame and the successor; groove of its surface. Thus, the optical axis of the lens turns out to be centered relative to the surface of rotation of the frame and the lens with a mandrel can be used as an assembly unit.

The closest to the present invention is a device that can be used for automatic centering of the pinz comprising a light source, a frame holder with a lens, a beam splitter, a photodetector array, a position sensor of the frame holder with a lens, an assembly, and a control circuit including a generator connected to the unit of comparison and separation of the difference, the block of photoelectric converters, the outputs of which through the unit of comparison

15 difference allocators are connected to the synchronizer t21.

However, the accuracy of centering with the use of the specified device is insufficient and cannot provide the corresponding performance. The known device provides automatic focusing of the lens by a positional electric drive, controlled as a function of the error of the mismatch. In order to solve the clock problem of ensuring that the optical axis of the rotation gel coincides with the axis of the hang-up, the device must be equipped with a cac. an additional drive (means of moving 1 perpendicular to the p direction in two coordinates), i.e. additional time is required. secured sequential operations, which for the electric drive (presumably, with the reducer) is more in comparison. with direct electromagnetic movements when using sufficiently high control voltage chokes; in addition, the error of positioning is summarized by law and the role control of the positional electric drive cannot provide the accuracy that is sometimes necessary for optical bodies. rotation The purpose of the invention is to increase the accuracy and speed of the device. This goal is achieved by the fact that the photodetector array is made in the form of three sectors at an angle of 120 to each other, with one of the receivers located at the sector junction point, and two controllers with a control unit and two transducers are introduced into the control circuit the pulse duration into the current impulse, the outputs of which are connected to the executive bodies, with one of the inputs of the control unit vf K-flip-flops connected to the output of the photoelectric converters unit, and the other to the output of the comparison unit ir the difference between the two outputs of the control unit of the control unit trigger mechanism is connected to the inputs of each of the 3 K-flip-flops, in addition, one of the inputs of the control module of the three-pole-flip-flops is connected to the input of the comparison and separation unit, and the output of the synchronizer is connected to the inputs of each from blocks converting the duration of a pulse into a current pulse. FIG. 1 shows the device, a general view; pas figs. 2 - trajectories of the spot of the beam reflected from the lens with a tangential (angular). deviation of the optical axis relative to the axis of rotation and also in the presence of its beating: in FIG. 3, the beam spot trajectory only in the presence of the beating of the optical axis in FIG. 4 is a diagram of impulses (on A, B, C - impulses that explain fig. 2, on G, D - they are the ones that explain fig. 3); in fig. 5 device, structural flow chart; in fig. 6 is a diagram of a pulse width to current pulse converter j in FIG. 7 is a device control circuit; The phi, 8–9 diagrams that explain the operation of the pulse width to current pulse converter. The device (Fig. 1) contains the holder I of the frame 2 with the lens 3, which is the core of the electromagnetic system, forming the objective sensor of the lens, and this system contains the electromagnet 4 with the coil 5.: In turn, this electromagnetic system is the second electromagnetic system containing electromagnet 6 and catuil 7. Both electromagnetic systems are made with the possibility of general rotation and relative displacement of electromagnets with a minimum fixation current of the Koreas, with the first measles-holder I having translational displacement within certain limits, and measles 4 - angular. The armature of the electromagnets interact with the vibrators 8 and 9, driven by electromagnets, mounted on the frame 10 with the possibility of angular displacement during adjustment. A frame 2 with a lens 3, the optical axis of which is centered relative to the axis of rotation, is machined over the surface 11 after the centering is performed. At an angle of 45 to the axis of rotation, a semitransparent beam splitter 12 is installed, through the center of which a beam of emit- ted 13 light passes, such as an optical quantum generator (LAG). The end surface of the holder is mosaic; then a spherical mirror system. The beam passing through the lens 3, is reflected from the reflecting surface of the holder, passes through the same lens and the beam splitter 12 onto the photosensitive matrix 14 and forms a light spot. Mosaic reflection of the reflector along the surface of the sphere (blunt relative to the beam) is due to a change in the angular position of the optical axis of the lens during the centering process. The mosaic disc must provide the ability to change the eccentricity of the optical axis. The light beam from the shielding photosensitive surface of the holder 1 and the splitter 12 on the photosensitive matrix 14 forms a light spot. The photosensitive surface of the matrix is made in the form of sectors 15 with a central circumference of 16, all 59 of which are sensory: the elements are connected to co-fog converters 17 of the current (Fig. 5), which generate electrical signals .. The optical axis of the lens 3 is centered relative to the axis of rotation tangentially and to reduce a beat for the subsequent groove of the surface 11 of the frame 2 at the end of the centering of the lens, after which the coils 5 and 7 of electromagnets 4 and 6 flow around the maximum current. . Obviously, in the rotation process of the non-centered lens 3, the laser beam, og. On the photosensitive surface of the matrix 14, describe a circle of radius J with its center shifted by q 1 (g 8, A ty) relative to the axis of the central photosensitive circle 16 (Fig. 2). When the optical axis of the line is centered by means of the vibrator-8 (Fig. 1), the center of the laser beam trajectory circle is aligned with the central axis of the photosensitive 1FIG matrix. 2), and by means of the vibrator 9, the radius of the circle is reduced to zero (Fig. 3). To ensure the centering of the lens tangentially (D o (.0) and to reduce the beat of optical soybeans to the axis of rotation (L2 0), there is a control device containing a block 17 of photoelectric converters (Fig. 7), a comparison and separation block 18 connected to it differences, a generator 19 connected to the input of this unit, a synchronizer 20, a trigger control unit 21 with two OK triggers 22 and 23 connected to its outputs, to the outputs of which are connected converters 24 and 242 of the pulse duration to a current pulse, to the outputs of which are connected vibrator thromagnets 25 and 26. The photoelectric converter unit 17 (Fig. 5) contains the elements 17, (- 17g, and the unit 18 for comparing and extracting the difference contains the keys 27, 27a and 28/1 - 283, the counters 29 - p. inputs connected to the outputs of the keys 27-275, input and I connected via keys 28-28 to the generator 19, a synchronization counter 30 with a diode matrix 31, outputs connected to the control inputs of the keys 28-28aj, bpoc 32 elements 3I, the first inputs; connected to the counting outputs of the counter 29, the second; - to the counting output of the counter 29, and third - to the counting 4 outputs of the counter 29e, and the output to the multi-input circuit OR 33, connected by an output to the counting input of the counter 34, the counting buses of which are connected to the inputs of the multi-input circuit OR 35, the output connected to the input of the demodule torus 36, the output of the driver 37 connected to the input. The control unit 21 contains a three-input OR 38 circuit, the inputs combined with an OR-flE 39 circuit, and a memory element -PS-trigger-40 Converter 24 /, (24) pulse duration into current impuy (Fig. 5 and 6) contains the integrator 41, the output is connected to the control input of the generator 42 of the sawtooth voltage, the output connected via the fan to the output of the majority element. 44, whose other entrance is merged with. the input of the pulse duration and current pulse. Let the spot trajectory of the beam (Fig. 2) be represented by a circle with a radius jO offset from the axis of the central circle 16 by AB (g 5) lRu). The photoelectric transducers of the signal-shaping unit 17, with an equal (approximate) motion of the spot beam around the circumference with an angular velocity of CO, accumulate impulses 1.11 and UI of different duration in accordance with the eccentricity value db. (Fig. 4A), which are controlled by means of controls keys 27-27a, and other controllable keys 28-28a, are filled with pulses of the generator 22 and the effect on the counting inputs, of the count 29-29a. , with a direct resolution sequence on the control inputs of the keys 28j, - 28. On the counters 29-29 of the comparison block 18 to the difference difference, the digital information {the temperature characterizing the duration of each of the pulses G, II, 111 (Fig. 4A) will be recorded, corresponding to the analog conversion of arc lengths circumferential-. gay a, Lgbg QbGio, radius j) (Fig. 2), Recording the digital information of each of the arcs in the counters 29d-29 is not done in one revolution of the spot of the beam ,; and through a series of revolutions, thanks to the synchronization counter 30, whose counting fields through the diode array 31 provide the clock switch on the recording via the VI revolutions of the beam. Such a slow process is necessary because the period is; the operation of the vibrators is incommensurable with the recording period of AND 1format1 in the counter and an order of magnitude longer. After switching the keys 27 and 272, the counters 29 and 31 display the information about the long duration of both pulses (circular arcs). With the third pulse, the photoreconverter body 17,. In the permitting period, on the control input of the key 28, the pulse of the inverter is filled with the pulses of the generator 19, By the schemes 3 of the Condominium 3 and the block 32, the counter 34 records information corresponding to the smallest of the periods of the pulses 1, P, W (Fig. 4 E). By demodulator 36 through a multi-input circuit OR 35 this pulse is converted into analogs (Fig. 4G), and shaper 37 ensures the formation of its fronts, control block 21 provides switching of ZK-flip-flop 22 until pulses I, II, III do not compare between each other in duration, and the switching period of it will decrease with a decrease in the difference period (F1P. 4B). After comparing the pulse periods 1, II and C1, the K-flip-flop 22 does not switch, as the differential pulse becomes zero, but starts switching from flip-flop 23, the switching period of which decreases in accordance with the decrease of the averaged pulse (Fig. 4G).) ., The diode matrix 31 forms the resolution impinges on the keys 28 / t-28 according to the law a – b – c b – c – d c – d –a Thus, the analog cpaBHHetme of circular arcs (Fig. 2) reduces the comparison cycle. The control unit 21 operates as follows. In the presence of 1 - potential at the inputs of the OR 39 and OR-HE 4O circuits from the outputs of the photoconverters of block 17, 1 potential forms at the R input of the CC-trigger 22, and the potential for the R-input of the 23 O The trigger is prepared for operation at the counting input (at the a-input - 1 - potential at the K input, O - potential). By a negative differential from the former 37 of the smallest pulse in duration from the pulses 1,11,1, and the OK-grgrer 22 switches for a period while 5 is negative 1M. The difference in the R input by the pulse from the output of the photovoltage converter 17 will not be returned to the initial state. By . as the difference period between said pulses decreases, the trigger switching period also decreases. The CC trigger 23 does not switch, because the 0 potential of the LC inputs forbids its switching during the switching periods of the LCD trigger 22, and when the latter stops switching, the conditions for switching the LCD trigger 23 through the counting input are provided: I-noTeH input and O-potential on Kvkhod. In the absence of a 1-pulse at the input of the OR-NOT 39 circuit at its output, 1 is the potential. With the appearance of a pulse at the input of this circuit, a negative differential RS-flip-flop 40 is switched to state 1-potential on the O-output. . With the appearance of a pulse (Fig. 4D) at the input of the OR-NO 4O circuit, a negative voltage drop is generated at its output, which switches the .OK flip-flop 23 until it returns to the initial position, a negative differential across the B-input, which will be provided by the RS-flip-flop 40 to the initial state by a negative differential across its P input (FIG. 4E), i.e. With the end of the averaged pulse (Fig. 4G), the K-flip-flop 23 will return to the initial state. The period is reduced by switching the 1: 1 of this trigger with a decrease in the duration of the sparse pulse. Converter 24 (24D) pulse duration in a current pulse operates as follows. The integrator 41, generating a linearly increasing voltage proportional to the pulse duration (Fig. 8A), provides the levels: Ucpi and ip2 (Fig. 8B) and stores them on the shadikator C1 (Fig. 6) until switching the thyristor D1 from the imaging unit 43. By means of a synchronization signal (Fig. 8 V; since Co, the sawtooth voltage generator 42 absorbs a linearly increasing voltage, but on a different time scale. Voltage level Ucpi; Ucpa applied to the control input of a pulverized voltage generator determines the latitude duration pulses & 3 t (Fig. 9A, B), which change the periods of operation of the majority element 44, the switching coil of the vibrator electromagnet. Fig. 9) switches the granisgor, the thyristor is switched on and the integrator 41 is provided.

With a simultaneous decrease in the switching period, the current in the coil of the electromagnet also decreases (Fig. 9B).

In accordance with the reduction of the switching period and current, the impact force of the vibrators is reduced. When an optical centering is achieved by a central photovoltage transmitter, the End of Centering signal is provided. With this, the fixation ejectromagnets are switched for a stronger setting, which is necessary for grooving the frame with the lens.

Thus, the striker is consistently working to reduce the tangential component and the eccentricity of the optical axis of the lens to the axis of operation, and in case of random shifts of the right, the sequence can automatically change.

The impact force of the impactors. As the components decrease, the de-centering changes and decreases as the centering state gets closer. Correspondingly, the angular micromovements are altered — at the beginning of the electromagnetic system, which fixes the holder with the lens, and then the translational perpendicular microdynamics to the axis of rotation with the choice of eccentricity.

Thus, the accuracy of centering the optical body increases and speed:

Claims (2)

1. USSR author's certificate number 569996, cl. О 02 В 7/16. 2. USSR author's certificate 50235-4 kp. q О2 В 7/04 (prototype). (Rig. G IT And JiilUJJ B pcs sh at 9g.Z 1, E, W well R D E U lf FIG. five t4 0h ig.8 Uci ftS i /.