CN203299433U - Large-sized grating adjusting device - Google Patents

Abstract

A large-sized grating adjusting device is composed of a grating mounting frame, a grating positioning jackscrew, a grating pitch adjusting platform, a mounting base plate, a displacement fine-tuning knob, a displacement fine-tuning knob positioning jackscrew, jack discs, a tension spring, a tension spring support rod, a gear set, a transmission lead screw, a bearing, a guide rail, a key, an angle fine-tuning knob, a driving gear positioning block and a level gauge. The large-sized grating adjusting device has the advantages of simple structure, convenient operation and high adjustment precision, and can be applied to an optical system which needs precision tuning on large-sized gratings.

Description

Large scale grating adjusting gear

Technical field

The utility model relates to a kind of large scale grating adjusting gear, is mainly used in the linewidth narrowing module of laser instrument and the Wavelength stabilized control of laser instrument.

Background technology

In the optical system of using the large scale grating, the most frequently used way is with the use that combines of pitching adjustment rack and height control frame, namely the large scale grating is fixed on the pitching adjustment rack by fixture, then the pitching adjustment rack is arranged on the height control frame, thereby realizes the adjustment of large scale grating.But,, because the large scale raster size is larger, cause this scheme physical dimension larger, and poor stability, be difficult in system, therefore limited its application.

The utility model content

The purpose of this utility model is to provide a kind of large scale grating precision adjustment unit.This device has the characteristics of compact conformation, good stability, can be applicable to wavelength tuning and the Wavelength stabilized control of laser instrument.

The technical scheme that the utility model solves the problems of the technologies described above is as follows:

a kind of large scale grating precision adjustment unit, by the grating installing frame, the grating positioning jackscrew, the grating pitch modulating platform, mounting seat, the displacement vernier adjustment knob, displacement vernier adjustment knob location jackscrew, take over a business, extension spring, extension spring pole, gear set, drive lead screw, bearing, guide rail, key, the angle vernier adjustment knob, driving gear locating piece and level meter form, grating installing frame upper surface has four threaded holes, the grating positioning jackscrew is connected with the grating installing frame by the threaded hole of grating installing frame upper surface, the large scale grating is fixed in the grating installing frame by the grating positioning jackscrew, be connected with the displacement vernier adjustment knob by extension spring between grating installing frame and grating pitch modulating platform, the two ends of extension spring are connected with the grating pitch modulating platform with the grating installing frame respectively by extension spring pole, the displacement vernier adjustment knob is fixed on the edge of grating installing frame by displacement vernier adjustment knob location jackscrew, circular groove is opened in position corresponding with the displacement vernier adjustment knob on the grating pitch modulating platform, take over a business by gluing mode and be fixed in circular groove, take over a business totally three, be cylindric, first takes over a business to have " V " type groove, and while installing, " V " type trench bottom is parallel with the grating length direction, second takes over a business to have cone tanks, the displacement vernier adjustment knob with take over a business to contact, by the displacement vernier adjustment knob is rotated, can realize the adjustment to the grating luffing angle, level meter is fixed on the upper surface of grating installing frame, horizontality in order to indication grating, gear set is comprised of driving gear and follower gear, be connected with drive lead screw by guide rail between mounting seat and grating pitch modulating platform, be connected by interference fit between the external diameter of bearing and mounting seat, drive lead screw is by two of bottoms cylindrical step, keyway and upper end accurate lead screw three parts form, drive lead screw is supreme connection bearing internal diameter respectively the end of from, follower gear and grating pitch modulating platform, adopt interference fit between drive lead screw and bearing bore diameter, adopt key connection for transmission moment between drive lead screw and follower gear, adopt and be threaded between drive lead screw and grating pitch modulating platform, by the rotational angle vernier adjustment knob, drive the rotation of driving gear, mesh and drive the follower gear rotation by gear set, follower gear connects and drives the drive lead screw rotation by key, thereby realize the height control of grating pitch modulating platform, namely realize the height control of large scale grating.

Described grating installing frame adopts integrated design, and two ends have semicircle groove, are convenient to the installment and debugging of grating.

The grating backing plate of plastic material is used for the large scale grating is installed, and is placed between grating positioning jackscrew and large scale grating.

The pitching tuning precision of described device is:

$\mathrm{\&alpha;}=\mathrm{<figure-callout\; id="1"\; label="arccos"\; filenames="HDA00002997309300011.png,HDA00002997309300032.png"\; state="\{\{state\}\}">arccos</figure-callout>}\frac{1}{\sqrt{\frac{{\mathrm{\&delta;}}_{\min }^2}{a^2{\mathrm{<figure-callout\; id="2"\; label="b"\; filenames="HDA00002997309300011.png"\; state="\{\{state\}\}">b</figure-callout>}}^2}+\frac{{\mathrm{\&delta;}}_{\mathrm{<figure-callout\; id="2"\; label="min"\; filenames="HDA00002997309300011.png"\; state="\{\{state\}\}">min</figure-callout>}}^2}{4a^2}+1}}$

Wherein: α is the adjustment angle of grating pitch modulating platform normal, and a is the distance of the first displacement vernier adjustment knob to the second displacement vernier adjustment knob and triple motion vernier adjustment knob connecting line, and b is the distance between the second displacement vernier adjustment knob and triple motion vernier adjustment knob, δ _minFor the precision of displacement vernier adjustment knob, i.e. maximum displacement.

The height tuning precision of described device is:

$H=\frac{\mathrm{\&theta;P}}{2\mathrm{\&pi;i}}$

Wherein: θ is the precision of angle vernier adjustment knob, i.e. minimum angular displacement, and P is the pitch of drive lead screw, i is the ratio of gear of gear set.

Technique effect of the present utility model:

The utility model can be realized large scale grating hair-breadth tuning, compare with classic method, advantage is: by the optimization to classic method, make its designs simplification, tuning precision raising, weight saving, cost, and can be tuning according to level meter and the levelness of monitoring grating, can be applicable to wavelength tuning and the Wavelength stabilized control of laser instrument.

Description of drawings

Fig. 1, Fig. 2, Fig. 3 and Fig. 4 are the utility model large scale grating precision adjustment unit structural representation.

Fig. 5 is the aligning elevation gear schematic diagram.

Fig. 6 is the height regulating mechanism schematic diagram.

Embodiment

See also Fig. 1, Fig. 2, Fig. 3 and Fig. 4, Fig. 1, Fig. 2, Fig. 3 and Fig. 4 are the utility model large scale grating precision adjustment unit structural representations.as seen from the figure, the utility model large scale grating precision adjustment unit, this device is by grating installing frame 1, grating positioning jackscrew 3, grating pitch modulating platform 4, mounting seat 5, displacement vernier adjustment knob 6, displacement vernier adjustment knob location jackscrew 7, take over a business 8, extension spring 9, extension spring pole 10, gear set 11, drive lead screw 12, bearing 13, guide rail 14, key 15, angle vernier adjustment knob 16, driving gear locating piece 17 and level meter 18 form, grating installing frame 1 upper surface has four threaded holes, grating positioning jackscrew 3 is connected with grating installing frame 1 by the threaded hole of grating installing frame 1 upper surface, the large scale grating is fixed in grating installing frame 1 by grating positioning jackscrew 3, are connected connection between grating installing frame 1 and grating pitch modulating platform 4 with the displacement vernier adjustment knob by extension spring 9, the two ends of extension spring 9 are connected with grating pitch modulating platform 4 with grating installing frame 1 respectively by extension spring pole 10, displacement vernier adjustment knob 6 is fixed on the edge of grating installing frame 1 by displacement vernier adjustment knob location jackscrew 7, circular groove is opened in position corresponding with displacement vernier adjustment knob 6 on grating pitch modulating platform 4, taking over a business 8 is fixed in circular groove by gluing mode, take over a business 8 totally three, be cylindric, first takes over a business 8.1 has " V " type groove, and while installing, " V " type trench bottom is parallel with the grating length direction, second takes over a business 8.2 has cone tanks, displacement vernier adjustment knob 6 with take over a business 8 and contact, by displacement vernier adjustment knob 6 is rotated, can realize the adjustment to the grating luffing angle, level meter 18 is fixed on the upper surface of grating installing frame 1, horizontality in order to indication grating, gear set 11 is comprised of driving gear 11.1 and follower gear 11.2, be connected with drive lead screw 12 by guide rail 14 between mounting seat 5 and grating pitch modulating platform 4, be connected by interference fit between the external diameter of bearing 13 and mounting seat 5, drive lead screw 12 is by two of bottoms cylindrical step, keyway and upper end accurate lead screw three parts form, drive lead screw 12 is supreme connection bearing 13 internal diameters respectively the end of from, follower gear 11.2 and grating pitch modulating platform 4, adopt interference fit between drive lead screw 12 and bearing 13 internal diameters, adopt key 15 connection for transmission moments between drive lead screw 12 and follower gear 11.2, adopt and be threaded between drive lead screw 12 and grating pitch modulating platform 4, by rotational angle vernier adjustment knob 16, drive the rotation of driving gear 11.2, drive follower gear 11.2 rotations by gear set 11 engagements, follower gear 11.2 connects and drives drive lead screw 12 rotations by key 15, thereby realize the height control of grating pitch modulating platform 4, namely realize the height control of large scale grating.

Described grating installing frame 1 adopts integrated design, and two ends have semicircle groove, are convenient to the installment and debugging of grating.

The grating backing plate 2 of plastic material is used for the large scale grating is installed, and is placed between grating positioning jackscrew 3 and large scale grating.

the utility model adopts " draw on three tops three " principle to realize the adjustment of large scale grating pitching, its structural representation sees also Fig. 5, " draw on three tops three " mechanism is a kind of physical construction commonly used in optical system, in the utility model, because the span of large scale grating is larger, it is optimized for three top six pull-up structure, it is converted into the rectilinear motion of displacement vernier adjustment knob 6 (" three tops ") the pitching adjustment of grating pitching platform 4, the first displacement vernier adjustment knob 6.1, the second displacement vernier adjustment knob 6.2, the position of triple motion vernier adjustment knob 6.3 is reduced to respectively an A, B, C, can suppose initial time, grating pitch modulating platform 4 maintenance levels, therefore, the position coordinates of three displacement vernier adjustment knobs 6 is respectively: A(-b/2, 0, 0), B (b/2, 0, 0), C (0, a, 0), wherein, a is the distance of the first displacement vernier adjustment knob 6.1 to second displacement vernier adjustment knobs 6.2 and triple motion vernier adjustment knob 6.3 connecting lines, b is the distance between the second displacement vernier adjustment knob 6.2 and triple motion vernier adjustment knob 6.3.When pitching is adjusted, can suppose that A, C keep static, B moves along Z axis, establishes δ _minFor the precision of displacement vernier adjustment knob 6, i.e. maximum displacement, the B coordinate of ordering is B (b/2,0):

$\stackrel{\&RightArrow;}{\mathrm{CA}}=(-\frac{b}{2},-a,0),---\left(1\right)$

$\stackrel{\&RightArrow;}{\mathrm{CB}}=(\frac{b}{2},-a,{\mathrm{\&delta;}}_{\min }),---\left(2\right)$

According to formula (1) and (2), the normal vector that can try to achieve grating pitch modulating platform 4 is adjusted into:

$\stackrel{\&RightArrow;}{\mathrm{OM}}=\stackrel{\&RightArrow;}{\mathrm{CA}}\&times;\stackrel{\&RightArrow;}{\mathrm{CB}}=(-a{\mathrm{\&delta;}}_{\min },\frac{\mathrm{<figure-callout\; id="2"\; label="b"\; filenames="HDA00002997309300011.png"\; state="\{\{state\}\}">b</figure-callout>}}{2}{\mathrm{\&delta;}}_{\min },\mathrm{ab}),---\left(3\right)$

Be Y=(0 by the normal vector of grating pitch modulating platform 4 before adjustment, 0,1), can obtain:

$\cos \mathrm{\&alpha;}=\frac{\stackrel{\&RightArrow;}{\mathrm{OM}}\&CenterDot;\stackrel{\&RightArrow;}{\mathrm{\&gamma;}}}{\left|\stackrel{\&RightArrow;}{\mathrm{OM}}\right|\&CenterDot;\left|\stackrel{\&RightArrow;}{\mathrm{\&gamma;}}\right|}=\frac{\mathrm{ab}}{\sqrt{a^2{\mathrm{\&delta;}}_{\mathrm{<figure-callout\; id="2"\; label="min"\; filenames="HDA00002997309300011.png"\; state="\{\{state\}\}">min</figure-callout>}}^2+\frac{{\mathrm{<figure-callout\; id="2"\; label="b"\; filenames="HDA00002997309300011.png"\; state="\{\{state\}\}">b</figure-callout>}}^2{\mathrm{\&delta;}}_{\mathrm{<figure-callout\; id="2"\; label="min"\; filenames="HDA00002997309300011.png"\; state="\{\{state\}\}">min</figure-callout>}}^2}{4}+a^2{\mathrm{<figure-callout\; id="2"\; label="b"\; filenames="HDA00002997309300011.png"\; state="\{\{state\}\}">b</figure-callout>}}^2}},---\left(4\right)$

In sum, move δ along the z direction of principal axis when displacement vernier adjustment knob 6 _minThe time, the angle that grating pitch modulating platform 4 rotates, i.e. grating pitching is adjusted precision and is:

$\mathrm{\&alpha;}=\mathrm{<figure-callout\; id="1"\; label="arccos"\; filenames="HDA00002997309300011.png,HDA00002997309300032.png"\; state="\{\{state\}\}">arccos</figure-callout>}\frac{1}{\sqrt{\frac{{\mathrm{\&delta;}}_{\min }^2}{a^2{\mathrm{<figure-callout\; id="2"\; label="b"\; filenames="HDA00002997309300011.png"\; state="\{\{state\}\}">b</figure-callout>}}^2}+\frac{{\mathrm{\&delta;}}_{\mathrm{<figure-callout\; id="2"\; label="min"\; filenames="HDA00002997309300011.png"\; state="\{\{state\}\}">min</figure-callout>}}^2}{{4a}^2}+1}}---\left(5\right)$

Wherein: a=270mm, b=23mm, δ _min=1 μ m, substitution formula (5) can obtain:

In classic method, the precision of the high precision pitching adjustment rack of generally selecting is 0.02 °, and therefore originally, the precision that in utility model, related method can be adjusted the grating pitching improves 8 times, and simple in structure, easy to operate.

The schematic diagram of height regulating mechanism as shown in Figure 6, angle vernier adjustment knob 16 and driving gear 11.1 coaxial rotation, driving gear 11.1 drives follower gear 11.2 rotations, drive lead screw 12 and follower gear 11.2 coaxial rotatings, and the minimum angular displacement of supposing angle vernier adjustment knob 16 is δ _min, the ratio of gear of gear set 11 is i, works as angle vernier adjustment knob 16 and turns over δ _minDuring angle, the angle that follower gear 11.2 rotates is:

$\mathrm{\&theta;}=\frac{{\mathrm{\&epsiv;}}_{\min }}{i}---\left(7\right)$

The pitch of supposing drive lead screw 12 is P, and due to drive lead screw 12 and follower gear 11.2 coaxial rotatings, therefore, when follower gear 11.2 turned over the θ angle, the height control amount of large scale grating (adjustment precision) was:

$H=\frac{{\mathrm{P\&epsiv;}}_{\mathrm{<figure-callout\; id="2"\; label="min"\; filenames="HDA00002997309300011.png"\; state="\{\{state\}\}">min</figure-callout>}}}{2\mathrm{\&pi;i}},---\left(8\right)$

Wherein: P=1mm, δ _min=0.01rad, i=10, the height control precision that substitution formula (8) can obtain the large scale grating is:

$H=\frac{{\mathrm{P\&epsiv;}}_{\mathrm{<figure-callout\; id="2"\; label="min"\; filenames="HDA00002997309300011.png"\; state="\{\{state\}\}">min</figure-callout>}}}{2\mathrm{\&pi;i}}=\frac{1\&times;0.01}{2\mathrm{\&pi;}\&times;10}\mathrm{mm}=1.59\&times;{10}^{-4}\mathrm{mm}---\left(9\right)$

In classic method, the adjustment precision of the high precision height control frame of generally selecting is 0.003mm, and therefore, method related in the utility model is not only simple in structure, and the height control precision is improved significantly.

In sum, compare with classic method, the mentioned large scale grating adjusting gear of the utility model is simple in structure, quality is light, the precision that the grating pitching is adjusted improves 8 times, the precision of grating height regulating mechanism improves 18 times, and its cost is lower, can be used widely aspect the tuning and Wavelength stabilized control of laser wavelength.

Claims (3)

1. large scale grating adjusting gear, by grating installing frame (1), grating positioning jackscrew (3), grating pitch modulating platform (4), mounting seat (5), displacement vernier adjustment knob (6), displacement vernier adjustment knob location jackscrew (7), take over a business (8), extension spring (9), extension spring pole (10), gear set (11), drive lead screw (12), bearing (13), guide rail (14), key (15), angle vernier adjustment knob (16), driving gear locating piece (17) and level meter (18) form, grating installing frame (1) upper surface has four threaded holes, grating positioning jackscrew (3) is connected with grating installing frame (1) by the threaded hole of grating installing frame (1) upper surface, the large scale grating is fixed in grating installing frame (1) by grating positioning jackscrew (3), be connected 6 by extension spring (9) with the displacement vernier adjustment knob between grating installing frame (1) and grating pitch modulating platform (4)) connect, the two ends of extension spring (9) are connected with grating pitch modulating platform (4) with grating installing frame (1) respectively by extension spring pole (10), displacement vernier adjustment knob (6) is fixed on the edge of grating installing frame (1) by displacement vernier adjustment knob location jackscrew (7), open circular groove in the upper position corresponding with displacement vernier adjustment knob (6) of grating pitch modulating platform (4), taking over a business (8) is fixed in circular groove by gluing mode, take over a business (8) totally three, be cylindric, first takes over a business (8.1) has " V " type groove, and while installing, " V " type trench bottom is parallel with the grating length direction, second takes over a business (8.2) has cone tanks, displacement vernier adjustment knob (6) with take over a business (8) and contact, by displacement vernier adjustment knob (6) is rotated, can realize the adjustment to the grating luffing angle, level meter (18) is fixed on the upper surface of grating installing frame (1), horizontality in order to indication grating, gear set (11) is comprised of driving gear (11.1) and follower gear (11.2), be connected with drive lead screw (12) by guide rail (14) between mounting seat (5) and grating pitch modulating platform (4), be connected by interference fit between the external diameter of bearing (13) and mounting seat (5), drive lead screw (12) is by two of bottoms cylindrical step, keyway and upper end accurate lead screw three parts form, drive lead screw (12) is supreme connection bearing (13) internal diameter respectively the end of from, follower gear (11.2) and grating pitch modulating platform (4), adopt interference fit between drive lead screw (12) and bearing (13) internal diameter, adopt key (15) connection for transmission moment between drive lead screw (12) and follower gear (11.2), adopt and be threaded between drive lead screw (12) and grating pitch modulating platform (4), by rotational angle vernier adjustment knob (16), drive the rotation of driving gear (11.1), drive follower gear (11.2) rotation by gear set (11) engagement, follower gear (11.2) connects and drives drive lead screw (12) rotation by key (15), thereby realize the height control of grating pitch modulating platform (4), namely realize the height control of large scale grating.

2. large scale grating adjusting gear according to claim 1, is characterized in that described grating installing frame (1) adopts integrated design, and two ends have semicircle groove, are convenient to the installment and debugging of grating.

3. large scale grating adjusting gear according to claim 1, is characterized in that the grating backing plate (2) of plastic material in addition, is used for the large scale grating is installed, and is placed between grating positioning jackscrew (3) and large scale grating.

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