JPH0131569B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic encoder, in which a magnetic sensor related to a magnetic detection element and a shaped circuit are configured on an HIC (hybrid IC) substrate related to a magnetic detection element substrate. This relates to a magnetic encoder that is capable of responding to large changes in the number of pulses by inserting and adhesively fixing it into a groove in a partition plate related to a support member, and by distributing the grooves into multiple pieces. be.

In a magnetic encoder that combines a magnetic sensing element such as an InSb magnetoresistive element and a magnetic recording medium, the number of pulses is determined by the number of teeth of the gear.

Further, the tooth pitch and the magnetic sensor related to the magnetic detection element have a certain relationship as shown in FIG.

That is, FIG. 1 is a relative dimensional relationship diagram between the tooth pitch of the magnetic gear and the magnetic sensor, where G is the magnetic gear, λ is its tooth pitch, and S is the magnetoresistive element MR ₁ ~This is a magnetic sensor according to MR ₄ .

This magnetic sensor S is patterned and manufactured using photolithography technology.

Therefore, to change the pattern, a new mask is required; essentially, the pattern remains unchanged.

Then, in order to change the number of pulses mentioned above, it is necessary to change the number of teeth while the tooth pitch is constant.

As a result, the diameter of the gear changes depending on the number of pulses.

Here, in such a magnetic encoder where the gap between the magnetic sensor S and the gear G is about 0.1 mm, the gap adjustment becomes a major problem.

In such a case, normally, as shown in FIG. 2 A and B, a fixed part 1A-1 and a movable part 1A-2 are provided on the partition plate 1A, which is a support member for the magnetic detection element board, and the movable part 1A- 2 to adjust the gap, then move the movable part 1A-2 to the fixed part 1A-2.
1 in some way.

However, the movable part 1A-2 must have a size that does not protrude from the fixed part 1A-1 due to thrust, and the part of the fixed part 1A-1
Since it is necessary to have a fixed part, it is difficult to increase the variation in the number of pulses that can be accommodated.

Further, the gap between the rotating gear G and the magnetic sensor S is about 0.1 mm, and the movable part 1A-2 must be reliably fixed to the fixed part 1A-1 against temperature changes and aging. Furthermore, since changes are likely to occur in the contact surfaces between the two, the fixing method itself has some technically difficult elements.

The present invention provides a partition plate as described above with a plurality of grooves distributed at a certain interval, and the groove into which the HIC magnetic sensing element board is inserted is formed with a gear diameter corresponding to the number of pulses requested by the customer. By selecting the movable part on the partition plate as in the past (i.e., the movable part where it is difficult to increase the change in pulse number and the contact surface with the fixed part is likely to change due to temperature changes or changes over time) The object of the present invention is to provide a magnetic encoder that can cope with large changes in the number of pulses using the same components without the need for a magnetic encoder.

A feature of the present invention is that a HIC magnetic detection element substrate, which is a combination of a magnetic detection element and a magnetic recording medium and has a magnetic sensor patterned thereon, is attached to a support member that supports the element substrate, and the support member is attached to a motor. In a magnetic encoder fixed to
A plurality of board insertion grooves are arranged in parallel at symmetrical positions with respect to the center of the support member that supports the HIC magnetic sensing element board, and each of the board insertion grooves has a distance from the center of the board support member. The difference between them is constant, and they are arranged in parallel in a symmetrical direction alternately and sequentially with respect to the center of the board support member. The difference in the diameter of the screw to be mated is the same as the difference in distance from the center of the board support member to each board insertion groove, and the HIC magnetic Mount the detection element substrate, maintain a predetermined gap between it and the corresponding magnetic recording body, and insert the substrate support member into the motor through the hole diameter of the support member and the screw fitted thereto. The magnetic encoder is fixed to the

The details are as follows.

That is, if the number of pulses is determined and the number of parts is large, a new mold may be made to manufacture the partition plate for that purpose. However, for products with small quantities, it is difficult to make new molds because it is not profitable. At present, when there are many requests for magnetic encoder samples, the problem is how to handle the different numbers of pulses using the same component.

Furthermore, the magnetic encoder according to the present invention is for low pulses, and needs to be able to cover about 70 to 150 pulses.

As described above, since the pulse range that changes is relatively narrow, the present invention adopts a method in which board insertion grooves are provided at certain intervals in the partition plate and the optimum groove is selected according to the number of pulses. Moreover,
If the difference between the diameter of the hole in the partition plate that attaches the partition plate to the motor and the diameter of the screw that is mated to it is the same as the difference in distance from the center of the partition plate to each board insertion groove, then the play in the diameter of the hole in the partition plate is However, it is possible to alleviate the stepwise change between grooves and cope with continuous changes in the number of pulses.

As a result, it is possible to fix the device using only the fixed part that has a proven track record in the past, which provides advantages such as reliability and the need to manufacture separate parts such as movable parts.

Next, embodiments according to the present invention will be described with reference to the respective figures.

First, A in FIG. 3 is a plan view of a partition plate in a magnetic encoder according to an embodiment of the present invention, B is a sectional view taken along line R-R, and A and B in FIG. , respectively, are partially opened cross-sectional views of magnetic encoders using the above-mentioned partition plates.

In the figure, 1 is a partition plate related to the support member of the HIC board 3 related to the magnetic detection element board, 2 is a gear that is a magnetic gear related to the magnetic recording body, and 4 is a DC motor (5 watts), for example. A shaft related to the rotating shaft, 5 an encoder cover, and 6 partition holes for fixing the partition plate 1 to the motor via screws (not shown).

1T-1 and 1T-2 are a group of board insertion grooves distributed in the horizontal axis direction of the partition plate 1.

Each board insertion groove group 1T-1, 1T-2
As shown in Fig. 3, from the center of the partition plate 1,
Intervals with different distances, that is, distances A, C, E, G, I on one side (left side) of the horizontal axis, and distances B, D, F, H on the other side (right side) of the horizontal axis. It consists of a pre-shaped board insertion groove.

Each of these distances is set, for example, as follows.

A=X…(22 millimeters) B=X+m…(22+2=24 millimeters) C=X+2m…(22+2×2=26 millimeters) D=X+3m…(22+3×2=28 millimeters) E=X+4m…(22+4×2 = 30 mm) F = X + 5 m... (22 + 5 × 2 = 32 mm) G = X + 6 m... (22 + 6 × 2 = 34 mm) H = In other words, the substrate insertion grooves corresponding to the distances A to I are each formed so that the difference in distance from the center is m, and that they are distributed from the center to the left and right sides every other time, If necessary, the partition plate 1 can be attached and used with the right and left sides reversed.

Here, X is the minimum dimension determined from the radius of the gear 2 with the smallest diameter for the gear mounting shaft,
If the distance difference m is the difference between the diameter of the hole in the partition plate when the partition plate 1 is fixed to the motor and the diameter of the screw mated thereto, then the play in the diameter of the hole in the partition plate will be the difference between the board insertion groove and the board. It is possible to alleviate the stepwise change with the insertion groove and correspond to continuous changes in the number of pulses.

Therefore, in the above, the numbers shown in parentheses indicate the respective distances when, for example, when installing to a motor with φ = 50 mm, X = 22 mm, and m = 2 mm. For example, the outer diameter of gear 2 is φ
It can be combined with gears with diameters ranging from =22 mm to φ =38 mm.

This means that if it is a gear with a module of 0.3,
The outer diameter of the gear = 0.3 x (number of teeth + 2), which corresponds to about 70 to 125 pulses, which is about the same as the number of teeth.

Therefore, in this case, if m = 2mm is the difference between the diameter of the hole in the partition plate and the diameter of the screw mated to it when the partition plate 1 is fixed to the motor, then as mentioned above, the hole in the partition plate The play in the diameter alleviates the stepwise change between the substrate insertion grooves and can accommodate continuous changes in the number of pulses. Note that when a spacer is temporarily inserted between the outer periphery of the gear 2 and the HIC magnetic sensing element board 3, and the gap between the two is finally removed, despite manufacturing errors and installation errors of the gear 2, First, it goes without saying that the above-mentioned backlash in the diameter of the partition plate hole absorbs these errors and is effective in accurately setting a gap between the outer periphery of the gear 2 and the HIC magnetic detection element substrate 3.

As described above, A in FIG. 4 shows the state with the largest number of pulses, and B in the same figure shows the state with the least number of pulses.

As in the embodiments described above, the following effects can be achieved by providing a plurality of distributed board insertion groove groups on the partition plate and selecting the optimum board insertion groove according to the number of pulses. This is something that can be expected.

(1) As there are no moving parts, the reliability of fixing is improved.

(2) There is no need to manufacture the moving parts as separate molds, and the number of parts can be reduced.

(3) There is no need to fix the movable part to the fixed part.

(4) A structure having a movable part can accommodate a wider pulse change range.

As mentioned above, in the embodiment configuration shown in FIG. 4 millimeters, which requires precision in forming the insertion groove (approximately 1 millimeter wide), but this is within the range that can be fully achieved due to the configuration of the groove mold. It is.

Taking these points into consideration, different from the above embodiment, a plurality of distributed configurations as shown in FIG. 5 can be adopted as another embodiment, and for convenience, The dimensions are the same as in Figure 3.

That is, A and B in FIG. 5 are a plan view and a sectional view of a partition plate in a magnetic encoder according to another embodiment of the present invention.

In the figure, 1-1 is a partition plate related to the support member of the magnetic detection element board, 1T-3 and 1T-5 are partition plates 1
The group of board insertion grooves 1T-4 and 1T-6 provided in a distributed manner in the horizontal axis direction of -1 is a group of board insertion grooves provided in a distributed manner in the vertical axis direction of the partition plate 1-1, The distances A to H are equivalent to those shown in FIG.

As shown in the figure, the board insertion groove group 1T-3 is arranged at intervals of different distances from the center of the partition plate 1-1, that is, on one side (left side) in the horizontal axis direction, A, E, At a distance of I, also the same 1
T-5 consists of board insertion grooves B and F formed at different distances on the other side (right side).

On the other hand, as shown in the figure, the board insertion groove group 1T-4 is spaced at different distances from the center of the partition plate 1-1, that is, distances C and G on one side (upper side) in the vertical axis direction. And, also, the same 1T-6
consists of substrate insertion grooves formed at distances D and H on the other side (lower side).

Therefore, this partition plate 1-1 can be used as necessary.
This is rotated, mounted and put into use as shown in FIG. 4, A and B, to form a magnetic encoder.

According to this example, the distance between the respective board insertion grooves is wider than in the previous example, and even in the previous numerical example, the distance is doubled to 8 mm, making it difficult to improve molding. There is no need to particularly consider accuracy, and at the same time, it is possible to expect the same effect as the previous embodiment.

In addition, as shown in FIG. 4, by supporting the encoder cover 5 on the partition plate 1 in addition to the HIC magnetic detection element board 3, the encoder cover 5 is not limited to the shape of the motor body. It is possible to standardize into one type, which increases the degree of product standardization and is economical.

Further, although the above embodiments use a motor shaft as an example of a rotating shaft, the present invention is a general-purpose device that can be attached to a wide range of other objects having a rotating shaft.

In summary, according to the present invention, a plurality of grooves are distributed at a certain interval on the partition plate that supports the HIC magnetic sensing element substrate, and the number of pulses required by the customer is By selecting the groove in which the HIC magnetic sensing element board is inserted with a gear diameter corresponding to the Moreover, it is possible to cope with large changes in the number of pulses using the same parts without providing a movable part whose contact surface with the fixed part tends to change due to changes. In other words, as mentioned above, if the number of pulses is fixed and the quantity is large,
The partition plate for this purpose may be manufactured by making a new mold. However, for small quantities, it is difficult to make new molds because it is not profitable, and when there are many requests for magnetic encoder samples as at present, it is difficult to make new molds for products with different numbers of pulses. The problem is how to deal with this problem using parts, but according to the present invention, the problems of the prior art described above can be solved all at once.

[Brief explanation of drawings]

FIG. 1 is a relative dimensional relationship diagram between the tooth pitch of the magnetic gear and the magnetic sensor, FIG. 2A is a plan view of a partition plate having a movable part and a fixed part, FIG. 3A is a plan view of a partition plate in a magnetic encoder according to an embodiment of the present invention, and FIG.
The cross-sectional view along the R-R line, A and B in Fig. 4, are
FIG. 5A is a plan view of the partition plate in a magnetic encoder according to another embodiment of the present invention, and FIG. It is a sectional view along the R line. 1, 1-1... Partition plate, 1T-1 to 1T-6...
...board insertion groove group, 2...gear, 3...HIC board,
4... Shaft, A to I... Distance, 5... Encoder cover, 6... Partition plate hole.

Claims (1)

[Claims] 1. A hybrid device in which a magnetic sensor is patterned by combining a magnetic sensing element and a magnetic recording medium.
In a magnetic encoder in which an IC magnetic sensing element board is mounted on a support member that supports the element board and the support member is fixed to a motor, the center of the support member that supports the hybrid IC magnetic sensing element board is used as a reference. , a plurality of board insertion grooves are arranged in parallel at symmetrical positions, and each of the board insertion grooves has a constant difference in distance from the center of the board support member, and is based on the center of the board support member. While they are arranged in parallel in a symmetrical direction, the difference between the hole diameter of the board support member for attaching the board support member to the motor and the diameter of the screw to be fitted thereto is determined from the center of the board support member. A hybrid IC magnetic sensing element substrate is installed in the substrate insertion groove selected from among the plurality of substrate insertion grooves that is the same as the difference in distance to the substrate insertion groove, and the distance between the hybrid IC magnetic sensing element substrate and the corresponding magnetic recording body is While maintaining a predetermined gap between the substrate supporting members,
A magnetic encoder, characterized in that it is fixed to a motor via the supporting member hole diameter and a screw fitted thereto. 2 In the invention described in claim 1,
A plurality of board insertion grooves are provided in parallel in each of the horizontal axis direction and the vertical axis direction orthogonal to the horizontal axis direction of the board support member with reference to the center of the support member that supports the hybrid IC magnetic sensing element board, and Each of the above-mentioned board insertion grooves has a constant difference in distance from the center of the board support member, and with respect to the center of the board support member, the board insertion groove closest to the center of the support member and the board insertion groove second closest to the center of the support member. The grooves are alternately distributed in one symmetrical direction, and the substrate insertion groove third and fourth closest to the center of the substrate support member are arranged in another direction orthogonal to the one symmetrical direction. A magnetic encoder in which the fifth and subsequent board insertion grooves are distributed in a symmetrical direction and arranged in the same manner as the above board insertion groove. 3. The magnetic encoder according to claim 1 or 2, in which, in addition to the hybrid IC magnetic sensing element substrate, an encoder cover is also supported by the substrate support member.