JPH0573772U - Optical recording medium and electrical connector applied to this medium - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose of the present invention is to integrate the optical recording medium and the usage information and the like relating to this medium so as to improve the operation of the optical recording medium and the reproducing device when the usage information and the like are used. An object of the present invention is to provide a container for an optical recording medium that can reduce the complexity and the operation error. Another object of the present invention is to provide an electrical connector capable of surely bringing the contacts provided on the optical recording medium side and the device side into contact with each other. [Structure] In the optical recording medium of the present invention, the semiconductor memory 3,
Electrically readable / rewritable non-volatile storage means 2 and 5 having 6 and contacts 4 and 7 connected thereto are integrally provided in the optical recording medium 1. Further, the contacts 4 and 7 on the optical recording medium 1 side are arranged concentrically around the drive shaft 13 of the device, and the device-side contact 14 is centered on the drive shaft 13.
Further, they are arranged on the circumference that coincides with the circumference of the concentric circles of the optical recording medium side contacts 4, 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical recording medium integrally provided with an electrically readable / rewritable nonvolatile memory means. Further, the present invention relates to an electrical connector for connecting the contact provided on the optical recording medium side and the device side contact provided on the apparatus side for rotationally driving the medium.

[0002]

[Prior Art]

 There is an optical recording medium as one of external storage media such as computers. This optical recording medium irradiates the surface of the medium with laser light or other light to record information, or reflected light of the irradiated light. A writable optical recording medium that retrieves recorded information based on the intensity of the light, or a read-only device that irradiates the surface of the medium with laser light or other light and retrieves the recorded information based on the intensity of the reflected light. Type read-only optical recording medium (hereinafter referred to as optical ROM). This optical ROM has an advantage that a medium on which information is recorded can be mass-produced because the information is created by pressing or other method at the time of manufacturing the medium. For this reason, in recent years, a CD-ROM in which a dictionary and data are recorded in this optical ROM and a compact disc (hereinafter referred to as a CD) in which high-quality sound is digitally recorded have been widely used. These read-only devices for reading information recorded on optical ROMs, CD-ROMs, and CDs have an output of laser light of 1 mW or less as a reading means, and thus are mass-produced and have a simple structure. Since it is possible to use a pickup, it is an inexpensive device.

Further, the optical recording medium includes a magneto-optical recording medium capable of writing and rewriting information at a high density by utilizing a laser beam and a magnetic field. There is also a partial ROM type magneto-optical recording medium in which a part is an optical ROM.

By the way, when the reproducing apparatus is connected to a computer and the information recorded in the optical ROM (optical ROM information) is used, the history of use, the user's memo, and the optical ROM information are personally recorded. It may be necessary to store usage information such as processing procedures. In order to record or manage such usage information, the following means are adopted. (1) The usage information is recorded on a floppy disk (hereinafter referred to as FD) and stored and reused in combination with an optical ROM. (2) The usage information is recorded in a fixed disk device (hereinafter referred to as HDD) and managed in pairs with an optical ROM. (3) In the reproducing device for CD, the user can arbitrarily set the reproducing order of the plurality of recorded sounds, and the semiconductor integrated in the reproducing device each time the user uses the CD. The playback order and the like are stored in a memory or a computer. (4) In a partial ROM type magneto-optical recording medium, usage information regarding the optical ROM information recorded in the optical ROM area is magneto-optically recorded in the writable area.

[0005]

[Problems to be solved by the device]

 When the above-mentioned usage information is recorded by such means, the following problems occur. In other words, (a) When recording the usage information in the FD, it is necessary to always store, move or manage the FD and the optical ROM in a set. For this reason, in order to reproduce and record the latest information on usage, a floppy disk drive (hereinafter referred to as FDD) must be connected to the computer to which the optical ROM reproducing device is connected, and the operation is complicated. become. (B) In the case of recording the usage information in the HDD, when the usage information is used in another computer that does not have this HDD built-in or is connected, this usage information is once recorded in the FD Information has to be transferred to the other computer via the computer, which not only makes the operation complicated but also easily causes an erroneous operation. (C) When the usage information is stored in the semiconductor memory of the playback device or the computer each time the user uses the CD, the information is recorded each time the device is reset or the CD is replaced. It has to be fixed and the operation becomes complicated. In all of these (a) to (c), the operation of the optical ROM medium and the medium in which the usage information related to the optical ROM information is recorded are not present because they are not integrated. There was a problem that the operation became complicated and that the erroneous operation was easily induced due to the complexity.

Further, (d) in order to perform magneto-optical recording in the writable area of the partial ROM type magneto-optical recording medium, not only 30 mW or more is required as the output of laser light, but also complicated writing is required. An optical head or circuit having such a structure is required. Therefore, the main purpose of using a part of the ROM type magneto-optical recording medium is to reproduce prerecorded information and not to record information in the writable area provided in the medium. However, there is a problem in that a driving device capable of magneto-optical recording, which is more expensive than a CD-ROM reproducing device, must be used.

The inventor of the present invention has conducted earnest research to solve the conventional inconveniences such as the complexity of operation of the optical recording medium and the reproducing apparatus and the easy occurrence of operation error, and as a result, electrical reading on the optical recording medium was performed. -If a rewritable non-volatile memory function is provided, the optical recording medium and usage information about this medium will be integrated, and the same handling characteristics as those obtained by performing electrical recording / reproducing on the optical recording medium itself will be obtained. The present invention has been completed and the present invention has been completed, and it has been found that the convenience of recording usage information and the like on an optical recording medium can be realized even by using an inexpensive read-only device. The present invention has been made in view of such a situation, and by integrating the optical recording medium and the usage information and the like regarding the medium, the optical recording medium and the reproducing apparatus when the usage information and the like are used are integrated. A first object of the present invention is to provide an optical recording medium capable of reducing operational complexity and reducing operational errors.

By the way, an electric contact arranged on one of the electric insulators and an electric contact arranged on the other of the electric insulators are brought into contact with each other at predetermined contacts to form an electric circuit. Conventionally, an electrical connector is used for connection. Then, the contacts arranged two-dimensionally on one of the electric insulators and the contacts arranged two-dimensionally on the other electric insulator are surely brought into contact with each other. To do this, at least two positioning points are required. Therefore, two or more mechanical guides, positioning pins, etc. are required to perform positioning of both contact points through this positioning point. As described above, since the conventional electrical connector requires two or more positioning points, there is a problem in that it cannot be used in a situation where the positioning point can be provided only at one place. Specifically, it is arranged on two electrical insulators that have no positioning means other than one guide pin and that can rotate relative to an arbitrary angle around this guide pin. However, there was the inconvenience that the contacts could not be brought into contact with each other's contacts determined by each other. More specifically, an optical recording medium having a disc shape and a fixing means (collet) for fixing the medium to a driving means (chucking table) for rotationally driving the optical recording medium are one drive. It is mounted so as to be rotatable relative to an arbitrary angle around the axis, and when contacts are arranged on the optical recording medium and the fixing means (collet), the conventional electrical connector can be set as a target for each other. There was the inconvenience that it was not possible to always make contact between the contacts.

As a result of earnest research on the contact arranging method and the contact locating mechanism in the electrical connector, the present inventor has a single locating point and moves the locating point at an arbitrary rotation angle around the locating point. If the contacts arranged on the two electrical insulators to be obtained are arranged in a circular or concentric circle and a contact positioning mechanism is provided at the center of the circle or concentric circles, the contacts will be determined by each other. We have found that it is possible to make contact with the contact point of the optical recording medium, and we have completed an optimal electrical connector when the contact point is provided on the optical recording medium side and the device side that drives it. The present invention has been made in view of such an actual situation, and can be suitably used in a configuration in which an optical recording medium and usage information and the like relating to this medium can be integrated, and is provided on the optical recording medium side and the device side. A second object of the present invention is to provide an electrical connector in which predetermined contacts can be surely brought into contact with each other.

[0010]

[Means for Solving the Problems]

 The present invention for achieving the first object is an optical recording medium in which an electrically readable / rewritable non-volatile storage means having a semiconductor memory and a contact connected thereto is integrally provided on an optical recording medium. It is a medium. The optical recording medium is a read-only type optical recording medium for taking out information recorded on the medium, a writable type optical recording medium for recording information on the medium and taking out information recorded on the medium, and the like. The semiconductor memory may be a writable read-only semiconductor memory capable of electrically erasing recorded information. Alternatively, the semiconductor memory may be composed of a battery and a read / write semiconductor memory capable of holding recorded information by the battery.

Further, according to the present invention for achieving the above second object, an optical read / write rewritable non-volatile storage means having a semiconductor memory and a contact connected to the semiconductor memory is integrally provided. An electrical connector for connecting the contact of the recording medium and a device-side contact provided in a device having a drive shaft for rotationally driving the optical recording medium, wherein the contact is circular about the drive shaft. Or electrical concentric circles, and the device-side contacts are arranged around the drive shaft and on a circle that coincides with the circle of the contacts or the circumference of the concentric circles.

[0012]

[Action]

 By integrally providing the non-volatile storage means in the optical recording medium, it is possible to record, erase, and reproduce the usage information about the optical recording medium in the semiconductor memory via the contact. it can. As a result, it is possible to obtain handleability equivalent to that of recording, erasing and reproducing information on the optical recording medium by electrical means. In other words, the optical recording medium and the usage information on this medium are integrated, and the operational complexity when using both the information recorded on the optical recording medium and the usage information on this medium is complicated. And the erroneous operation is less likely to occur. Furthermore, the information recorded in the non-volatile storage means is electrically read out at the stage of mounting the optical recording medium on the device for reproducing the information recorded in the optical recording medium, that is, before the optical reproduction of the optical recording medium. be able to. Even in the case of a read-only optical recording medium, recording of usage information and the like on the nonvolatile storage means integrally provided in this medium allows electrical recording on the optical recording medium itself. The same operability as that obtained can be obtained, and the range of use of the read-only optical recording medium is expanded. Further, even in the case of a writable optical recording medium, if the main purpose of using the medium is to reproduce previously recorded information and the information is not to be recorded in the medium, the optical recording medium is used. The convenience of being able to record usage information and the like can be realized even by using an inexpensive read-only device.

Further, if the electrical connector is configured in this way, the drive shaft of the device serves as a positioning point, and the radius from this positioning point to the contact point on the optical recording medium and the device side from the same positioning point. The radius to the contact is equal. Therefore, even if the optical recording medium and the device-side contact rotate relative to each other around the drive shaft, that is, the positioning point, the optical recording medium-side contact and the device-side contact can contact with each other's mutually determined contacts. become.

[0014]

【Example】

 Hereinafter, an optical recording medium according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an optical recording medium according to an embodiment of the present invention. As shown in the figure, the optical recording medium 1 is integrally provided with an electrically readable / rewritable nonvolatile storage means 2. The nonvolatile storage means 2 stores usage information such as the progress of use of the optical recording medium, a user's memo, and a procedure for personally processing the optical ROM information. Examples of the optical recording medium 1 include an optical ROM, a CD-ROM, a CD, a magneto-optical recording medium, and a partial ROM type magneto-optical recording medium. The nonvolatile memory means 2 has a semiconductor memory 3 and a contact 4 electrically connected to the semiconductor memory 3. The illustrated semiconductor memory 3 is a writable read-only semiconductor memory (hereinafter referred to as an EEPROM) capable of electrically erasing recorded information. When the EEPROM 3 is used as the semiconductor memory, the write / read / erase line of the EEPROM 3 is wired to the contact 4.

FIG. 2 is a block diagram showing an optical recording medium according to another embodiment of the present invention. As illustrated, the optical recording medium 1 is integrally provided with an electrically readable / rewritable non-volatile storage means 5. The nonvolatile memory means 5 has a semiconductor memory 6 and a contact 7 electrically connected to the semiconductor memory 6 as in the above-described embodiment. However, the semiconductor memory 6 in this embodiment includes a battery 8 And a read / write type semiconductor memory (RAM or DRAM, hereinafter referred to as RAM) 9 capable of holding recorded information by the battery 8. When the RAM 9 is used as the semiconductor memory 6, the write / read line of the RAM 9 is wired to the contact 7.

As shown in FIG. 3A, the semiconductor memories 3 and 6 and the contacts 4 and 7 are mounted on a substrate 10 having a ring shape. As shown in FIG. 1B, the substrate 10 is laminated on the optical recording medium 1 via an adhesive means such as an adhesive.

Further, as shown in FIG. 4, a chucking table 11 on which the optical recording medium 1 is mounted and a mounting table 11 are mounted on an apparatus for reading or writing information recorded on the optical recording medium 1. And a collet 12 for fixing the optical recording medium 1 to the chucking table 11. The chucking table 11 and the collet 12 form a drive shaft 13 that rotationally drives the optical recording medium 1. The collet 12 is formed with a fitting protrusion 12a that fits into a recess 11a provided in the chucking base 11. The lower end surface of the collet 12 is provided with a device-side contact 14 that comes into contact with the contacts 4 and 7 of the non-volatile storage means 2 and 5. A write / read / erase line or a write / read line is also wired to the device side contact 14 depending on the type of the semiconductor memories 3 and 6. The device-side contact 14 is connected to the CPU in the computer via a simple circuit. The device side contact 14 and the non-volatile memory means side contacts 4 and 7 are brought into contact with each other by fixing the optical recording medium 1 to the chucking base 11 with a collet 12.

The mounting positions of the EEPROM 3, the RAM 9 or the battery 8 with respect to the contacts of the non-volatile memory means 2 and 5 are not limited to the positions shown in FIGS. 1 and 2, but the optical recording medium 1 may be rotated or moved. It can be appropriately changed within a range that does not hinder the contact state with the device side contact 14. Further, in the illustrated example, the case where both the semiconductor memories 3 and 6 and the contacts 4 and 7 are mounted on the same substrate 10 is shown. The substrates on which 4 and 7 are mounted may be attached to the optical recording medium 1 respectively.

Next, the configuration of the contact 14 on the device side and the contacts 4, 7 on the optical recording medium side will be described in detail based on the principle diagrams of the electrical connector shown in FIGS. As shown in FIG. 5, three contacts 22, 23, 24 are concentrically arranged on the first electrical insulator 21 having a disc shape, and a wiring 25 is connected to each of the contacts 22-24. .. Further, three contacts 32, 33, 34 are concentrically arranged on the second electrical insulator 31 having a disc shape, and a wiring 35 is connected to each of the contacts 32 to 34. The outermost concentric concentric contacts 22 and 32 of the electric insulators 21 and 31 are the first set of contacts to be in contact with each other, and the concentric contact points 23 and 33 located closer to the center than this set. And are the second set of contacts to contact each other, and the most centered concentric contacts 24 and 34 are the third set of contacts to contact each other. The concentric contacts 22 and 32 in the first set have the same radius. Similarly, the concentric contact points 23 and 33 and 24 and 34 in the second and third sets also have the same radius. A through hole 26 having a predetermined size is formed at a center point of the concentric circle in the first electric insulator 21, and a center point of the concentric circle in the second electric insulator 31 is substantially equal to the inner diameter of the through hole 26. A convex portion 36 having the same outer diameter and fitted into the through hole 26 is provided. A contact positioning mechanism 40 that regulates the contact position between the concentric circular contacts 22 to 24 of the first electric insulator 21 and the concentric circular contacts 32 to 34 of the second electric insulator 31 by the through holes 26 and the convex portions 36. It is configured.

When connecting both electric insulators 21 and 31, as shown in FIG. 6, the convex portion 36 of the second electric insulator 31 is fitted into the through hole 26 of the first electric insulator 21. Then, the first and second electrical insulators 21 and 31 are butted against each other. At this time, the concentric contacts 22 and 32, 23 and 33, 24 and 34 in each set of contacts to be contacted have the same radius, and the concentric circles of the first and second electrical insulators 21 and 31 are Since the contact position determining mechanism 40 is provided at the center, the concentric contact points 22 and 32, 23 and 33, and 24 and 34 in each set are surely contacted. Further, as conceptually shown in FIG. 7, even when the first and second electric insulators 21 and 31 relatively rotate around the contact positioning mechanism 40, the respective contacts 22 to 24 and 32. Since ~ 34 are concentric circles, the contact state is maintained.

The case where a plurality of concentric circular contacts are provided as an electrical connector is shown. However, when there is one contact, the contacts are arranged in a circular shape on one of the electrical insulators and the other electrical contact is arranged. It is clear that the contacts may be arranged in a circular shape on the insulator, the circular contacts may have the same radius, and the contact positioning mechanism may be provided at the center of the circle of the circular contacts. Moreover, one of the two electrical insulators is provided with a circular contact point or a concentric circular contact point, and the other electrical insulator is provided with a circular contact point or a concentric circle point on the circumference. It is also possible to provide one or more points of contact with each other.

In the electrical connector shown in the above principle diagram, there is only one positioning point, and two electrical insulators 21 that can move around the positioning point at any rotation angle are provided. It becomes possible to bring the contacts arranged on the contacts 31 and 31 into contact with each other's contacts 22 and 32, 23 and 33, and 24 and 34, which are mutually determined, and only one position has a positioning point. Even if the electrical connector is mounted on an object whose circumferential angle between the two points around the positioning point is not constant, the electrical connection is ensured.

Then, when this electrical connector is applied to the optical recording medium 1 in which the nonvolatile memory means 2 and 5 are integrally provided, the following is performed. That is, as shown in FIG. 8, the optical recording medium 1 corresponds to the first electrical insulator 21, and the write / read / erase line of the EEPROM 3 which is the contact 4 of the nonvolatile storage means 2 and 5 is the first electrical insulator. 21 corresponding to the concentric contacts 22 to 24. The collet 12 corresponds to the second electric insulator 31, and the write / read / erase lines wired to the device side contact 14 correspond to the concentric circular contacts 32 to 34 of the second electric insulator 31. The device side contact 14 is arranged around the drive shaft 13 composed of the chucking table 11 and the collet 12 and on the circumference that coincides with the concentric circles of the optical recording medium side contacts 4 and 7. .. Further, the center hole 1a of the optical recording medium 1 corresponds to the through hole 26 of the contact positioning mechanism 40, and the fitting convex portion 12a of the collet 12 corresponds to the convex portion 36 of the contact positioning mechanism 40. When the RAM 9 is used as the semiconductor memory 6, the contact 7 of the non-volatile storage means 5 and the device side contact 14 are two sets of concentric circular contacts. Incidentally, reference numeral “15” in FIG. 8 indicates a spindle motor for rotationally driving the optical recording medium 1.

Next, the operation of the embodiment will be described. As shown in FIG. 4, after the optical recording medium 1 is placed on the chucking base 11, the fitting convex portion 12a of the collet 12 is fitted into the concave portion 11a of the chucking base 11, and the collet 12 is used for optical recording. The recording medium 1 is fixed to the chucking table 11. Then, the contacts 4 and 7 of the nonvolatile storage means 2 and 5 on the optical recording medium 1 and the device side contact 14 provided on the collet 12 come into contact with each other. Via these contacts 4, 14 (7, 14), the usage information recorded in the semiconductor memories 3, 6 such as the EEPROM 3 and the RAM 9 is read, new usage information is written, and the recorded usage information is erased. Is done.

In this way, the electrically readable / rewritable non-volatile storage means 2, 5 are integrally provided on the optical recording medium 1 to record usage information and the like in the semiconductor memories 3, 6. As a result, even in the case of a read-only optical recording medium (optical ROM) that could not be used to write a record in the past, it is possible to obtain the same handling property as that of electrically recording / reproducing on the medium itself. It has become possible to expand the range of use of dedicated optical recording media (optical ROM).

Further, by integrally providing the non-volatile storage means 2 and 5 in the optical recording medium 1, the mediums 3 and 6 in which the usage information is recorded and the optical recording medium 1 in which the optical ROM information is recorded are provided. It means to exist as a unit. As a result, the optical recording medium 1 and the usage information about the medium 1 are integrated, and both the information recorded on the optical recording medium 1 and the usage information about the medium 1 are used. In this case, there is no need to record the usage information in the FD or HDD for storage and to move the usage information to another computer via the FD. Therefore, when the optical ROM information and the usage information are used at the same time, it is possible to reduce the troublesomeness in the conventional operation such as storage, movement, and use, and the occurrence of erroneous operation is also reduced. It becomes possible.

Further, in order to use the usage information, it can be realized by providing a contact 14 on the device side and adding a few circuits. Therefore, a relatively inexpensive reproducing device for a read-only optical recording medium. Can be used as is. Even if the optical recording medium 1 is partly a ROM type magneto-optical recording medium, its main purpose is to reproduce previously recorded information, and the information is recorded in the writable area provided in the medium 1. If not, the convenience of recording usage information and the like on the optical recording medium 1 is achieved by using a relatively inexpensive reproducing apparatus without using an expensive magneto-optical recording drive device. It can be realized by

Further, in the optical library device, at the time when the optical recording medium 1 is stored in, for example, the library device before the optical recording medium 1 is optically reproduced, the medium 1 recorded in the non-volatile storage means 2 and 5 is stored. It is possible to realize a device that can electrically read out attributes, and the operability is significantly improved.

Further, as is clear from the principle diagrams shown in FIGS. 5 to 7, even if the optical recording medium 1 is placed on the chucking base 11 with a central angle indefinite, each contact point to be contacted. The concentric contact points in the set have the same radius, and the contacting positioning is performed by fitting the fitting convex portion 12a of the collet 12 into the central hole 1a of the optical recording medium 1 and the concave portion 11a of the chucking base 11. Since the function of the mechanism 40 is exerted, the predetermined contacts provided on the device side and the nonvolatile storage means side are surely brought into contact with each other. Further, even when the optical recording medium 1 and the collet 12 relatively rotate about the contact positioning mechanism 40, the contact state of each contact is reliably maintained.

[0030]

[Effect of the device]

 As described above, in the optical recording medium of the present invention, the electrically readable / rewritable non-volatile storage means having the semiconductor memory and the contacts connected to the semiconductor memory is integrally provided. Since the medium and the usage information about this medium are integrated, the operational complexity of using both the information recorded on the optical recording medium and the usage information about this medium is reduced. As a result, there is an effect that erroneous operations are less likely to occur. Furthermore, the information recorded in the non-volatile storage means can be electrically read out before the optical reproduction of the optical recording medium, and the operability is remarkably improved. In addition, even if it is a read-only optical recording medium, it is possible to obtain the same handling property as that of performing electrical recording on the optical recording medium itself, and it is possible to expand the range of use of the read-only optical recording medium. Became. Further, even in the case of a writable optical recording medium, if the main purpose of using the medium is to reproduce previously recorded information and the information is not to be recorded in the medium, the optical recording medium is used. It is now possible to realize the convenience of being able to record usage information, etc., even by using a low-priced read-only device.

Further, according to the electrical connector applied to the optical recording medium of the present invention, the positioning point is one place, and each of the two objects that can move at an arbitrary rotation angle around the positioning point is used. It is now possible to make sure that the placed contacts make contact with the contacts of the other party that are determined by each other.

[Brief description of drawings]

FIG. 1 is a block diagram showing an optical recording medium according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an optical recording medium according to another embodiment of the present invention.

FIG. 3A is a cross-sectional view showing a substrate on which a semiconductor memory and contacts are mounted, and FIG. 3B is a cross-sectional view showing a state in which the substrate is stuck on an optical recording medium. ..

FIG. 4 is a sectional view showing a main part of an apparatus for reading or writing information recorded on an optical recording medium.

FIG. 5 is a configuration diagram showing the principle of an electrical connector.

6 is a cross-sectional view showing a state in which the two electric insulators shown in FIG. 5 are abutted with each other.

FIG. 7 is a conceptual diagram showing an operation when the two electric insulators shown in FIG. 5 are relatively rotated around a contact positioning mechanism.

FIG. 8 is a diagram showing the electrical connector shown in FIG.
It is a perspective view showing an example applied to an optical recording medium integrally provided with a non-volatile storage means.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical recording medium 2, 5 ... Non-volatile storage means 3, 6 ... Semiconductor memory 4, 7 ... Contact point 14 ... Device side contact point 22-24, 32-34
… Concentric contacts 40… Contact positioning mechanism

Claims (2)

[Scope of utility model registration request] 1. An optical recording medium in which an electrically readable / rewritable non-volatile storage means having a semiconductor memory and a contact connected to the semiconductor memory is integrally provided on the optical recording medium. 2. The contact of an optical recording medium integrally provided with a non-volatile memory capable of electrically reading and rewriting, the semiconductor memory and a contact connected thereto, and the optical recording medium is rotationally driven. An electrical connector for connecting a device side contact provided in a device having a drive shaft, wherein the contact is arranged in a circle or concentric circles about the drive shaft, and the device side contact is An electrical connector arranged around a drive shaft and on a circumference that coincides with a circumference of a circle or concentric circles of the contact.