CN87210099U - Structure of microscopic spring objective with adjustable focal length - Google Patents

Abstract

The utility model provides a structure of a microscopic spring objective with adjustable focal length. A long limited slot of an external base of the existing spring objective structure is lengthened to one end of the object plane by the utility model. The front external threading of the external base is extended to the end surface direction of a focus. The front external threading of the external base is provided with two nuts additionally. The structure can adjust the focal length per se, the precision of the focal length can be improved above 0.005MM (40*-100*) which catches up with or exceeds the world advanced level. The precision of a lens which has irregular focus can be improved by the structure, and the lens which has irregular focus is turned into a qualified product. When the objective is changed, the focus does not need to be adjusted again, or the focus needs to be adjusted lightly, and the vivid image can be obtained.

Description

Structure of microscopic spring objective with adjustable focal length

The utility model relates to a kind of microscope spring objective lens arrangement.

Existing spring objective lens arrangement is an objective lens to be inserted in have microscler stopper slot and by in the threaded outer seat of object plane end car; putting into spring compresses with trim ring; objective lens is fixed by pin; cover for seat goes into the trade mark cover and screws in protheca to constitute outside then; the objective lens of this structure position of seat outside is to be determined by object plane direction one end by the microscler stopper slot of outer seat by pin; because the effect of spring; objective lens outside the seat in can in contract; play the effect of protection sample and object lens; but the objective lens working position of seat outside can not be regulated; the calibrated asterism of object lens reaches behind lathe grinding parfocalization end face; its parfocal distance just can not change; the parfocalization precision depends on the cutting precision of parfocalization end face, thereby the parfocalization precision can only remain within the 0.03MM.

General biological microscope all is furnished with 4 *, 10 *, 40 * (bullet), four camera lenses of 100 * (oily bullet) one covers, press the regulation of GB2985-82, the parfocalization precision from 4 *-10 * be 0.15MM, 10 *-40 * be 0.06MM, 40 *-100 * be 0.03MM, the factory that this standard is furnished with the parfocalization lathe all can reach, but because the wearing and tearing of parfocalization Lathe turning tool, reasons such as operator's determined level, the parfocalization precision is very unstable, and not noting slightly promptly has error, in addition, this standard has gap with more external advanced countries.For example, German Democratic Republic TGL standard is: 4 *-10 * be 0.03MM, 10 *-40 * be 0.01MM, 40 *-100 * be 0.005MM, high like this standard is difficult to reach in the existing production technology of China.

The purpose of this utility model provides a kind of adjustable parfocal distance own, can improve the microscope spring objective lens arrangement of parfocalization precision.

The purpose of this utility model is achieved in that the microscler stopper slot with the outer seat of original microscope spring objective lens arrangement extends to object plane one end, make it to stretch into the protheca threaded portion (seeing the solid line position of elongate slots among Fig. 2) of outer seat, and the preceding external threading of seat is expanded to parfocalization end face direction outward, adds two nuts on the preceding external threading of seat outside then.One has been the stop nut of position-limiting action, and another has been the nut that tightens up of the effect of tightening up, and stop nut makes the working position of pin be become by stop nut by object plane end location by original stopper slot and locatees.The rotary stopper nut can change its axial location of seat outside, thereby makes the working position of pin obtain changing.Because pin is fixed on the objective lens, thereby objective lens also obtains changing in the working position on the seat outside.Outer seat is fixed on the microscopical Nosepiece by the object lens screw thread of outer seat, since objective lens outside the seat on the working position scalable, mean that object lens when being fixed on 45MM, can obtain clearly image by regulating stop nut to sample object plane (11) at its parfocalization end face (12) (seeing accompanying drawing 1).Tighten up nut and can tighten up stop nut, the stop nut stationkeeping that mixes up is no longer changed.The size of the preceding external threading expansion of seat can determine according to the actual conditions of existing microscope spring objective lens arrangement outside the length that stopper slot extends reached, but must make pin have enough positions to regulate, and assurance adjusting stop nut can obtain image clearly.

Structure of the present utility model can be applicable to common achromatism, and half flat field achromatism is on the spring object lens such as flat field achromatism.

The concrete control method of microscope spring objective lens arrangement of adjustable parfocal distance of the present utility model is as follows: the assembling 40 *, during 100 * (oil) spring camera lenses, stop nut should make objective lens meet the Theoretical Calculation size with respect to the distance of the parfocalization face of outer seat, that is be that the working position of objective lens is on the position of Theoretical Calculation, tighten and tighten up nut, proofread and correct asterism and the outer seat of cutting parfocalization face then.4 *, 10 * object lens needn't be made the spring camera lens because operating distance is longer, also be far from being to adopt structure of the present utility model, four camera lenses (4 *, 10 *, 40 *, 100 *) supporting when being installed on the microscope main frame, check the parfocalization precision of camera lens.The burnt lathe of 4 *-10 * snap guarantees.As undesirable, then change camera lens and reach.Supporting 4 *, behind 10 * object lens, with 10 * be as the criterion, regulate microscope rough micro-moving mechanism handwheel, make it to obtain image clearly, go to 40 * camera lens, low excessively as the parfocalization precision, at this moment the fine motion handwheel of not using force tightens up nut but unscrew, and regulates stop nut, make it to obtain image equally clearly, tighten then and tighten up nut, regulate 40 * after, go to 100 *, nonconforming as the parfocalization precision, regulate with above-mentioned method, until 10 *-40 *, 40 *-100 * the parfocalization precision reach respectively till 0.01MM and the 0.005MM.

Use the microscope spring objective lens arrangement of adjustable parfocal distance of the present utility model, when the conversion object lens, needn't focus again or only need and slightly focus, can obtain image clearly, make the parfocalization precision bring up to 0.005MM above (40 *-100 *), advanced international standard forereaches.Even the original not camera lens of parfocalization of a cover adopts structure of the present utility model,, also can improve precision and become certified products by regulating.Because structure of the present utility model can improve the parfocalization precision, and the requirement of parfocalization lathe is also suitably loosened.

Fig. 1 is the synoptic diagram of the microscope spring objective lens arrangement of adjustable parfocal distance of the present utility model.Wherein 1 is to tighten up nut, the 2nd, and stop nut, the 3rd, pin, the 4th, objective lens, the 5th, protheca, the 6th, outer seat, the 7th, trade mark cover, the 8th, spring, the 9th, trim ring, the 10th, microscler stopper slot, the 11st, sample object plane, the 12nd, parfocalization face, the 13rd, the preceding external threading of outer seat, the 14th, the object lens screw thread of outer seat.

Fig. 2 is the microscler stopper slot synoptic diagram of the outer seat of microscope spring objective lens arrangement of adjustable parfocal distance of the present utility model.Wherein 10 is microscler stopper slots, and dot-and-dash line is the stopper slot of original spring object lens, and solid line is the utility model stopper slot; The 13rd, the preceding external threading of outer seat is the length of original screw thread till dot-and-dash line, is the outer seat protheca reach after the expansion till the solid line.

With original 40 *, the microscler stopper slot (10) of the outer seat of 100 * spring objective lens arrangement extends to object plane one end, make it stretch into the protheca threaded portion 3-4MM of outer seat, the preceding external threading of outer seat is to parfocalization end face direction expansion 1-2MM, be screwed into stop nut (2) and tighten up nut (1) on the preceding external threading of seat outside then, promptly get of the present utility model 40 *, the microscope spring objective lens arrangement of 100 * adjustable parfocal distance, with they and 4 *, 10 * object lens are in groups supporting, load onto the microscope main frame, regulate as stated above, can make the parfocalization precision reach designing requirement of the present utility model.

Claims (1)

1. A kind of by pin (3), objective lens (4), protheca (5), trade mark cover (7), spring (8), trim ring (9) and have the microscope spring objective lens arrangement of the adjustable parfocal distance that the outer seat (6) of microscler stopper slot (10) and screw thread forms is characterized in that the outer microscler stopper slot of seat (10) extends to object plane one end, the preceding external threading of outer seat is added with stop nut (2) outside and tightens up nut (1) to the expansion of parfocalization end face direction on Zuo the preceding external threading.

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