Abstract: A gas detector comprises a gas detection unit and a filter introducing surrounding atmosphere to the gas detection unit. The filter comprises a gas-permeable organic polymer membrane having an acidic group or a basic group.

Abstract: A model generation apparatus includes a processor that is configured to: acquire information data for learning, acquire document data for learning, extract a first portion and a second portion having a lower rate of match with the information data than the first portion from the document data based on a rate of match between the information data and each portion of the document data, generate a first machine learning model by using first learning data in which first data for learning included in the information data is used as input data and the first portion is used as correct answer data, and generate a second machine learning model by using second learning data in which second data for learning included in the information data is used as input data and the second portion is used as correct answer data.

Abstract: An information processing apparatus including: plural models including at least a first model that uses first data as input to carry out a first prediction task and a second model that uses second data as input to carry out a second prediction task different from the first prediction task, and at least one processor, in which the processor is configured to: acquire information data representing information related to a specific target; select a selection model to be used for prediction from among the plural models based on the information data; and derive a degree of importance to the specific target for each item included in the information data by using the selection model.

Abstract: An information processing apparatus includes at least one processor, in which the processor is configured to: for a machine learning model that uses a document data group including a plurality of document data as input and outputs output data, derive an evaluation value in the machine learning model for each document data included in the document data group.

Abstract: A keyboard instrument includes a key including a key base including a top surface and a top surface support portion provided as to be suspended perpendicularly from a lower surface of the top surface, and an attachment configured to be disposed on a side surface of the top surface support portion. The top surface support portion includes a thick portion of a first thickness which is a thickness defined in a key alignment direction and a thin portion of a second thickness which is thinner than the first thickness in different positions along a longitudinal direction of the key base. A contact area with the attachment at the thick portion is larger than a contact area of the thin portion with the attachment.

Abstract: A keyboard instrument includes a key which includes a weight, and a key base including a top plate and at least one rib configured to fix the weight by holding the weight from below in such a state that the weight is kept in abutment with a lower surface of the top plate.

Abstract: A method for assembling a keyboard instrument includes installing a keyboard unit on a lower case such that an insertion hole of a key-connecting part of the keyboard unit is positioned corresponding to a lower side installation part of the lower case; thereafter, placing a upper case on the keyboard unit such that an upper side installation part of the upper case is positioned inside the insertion hole of the key-connecting part of the keyboard unit and mates with the lower side installation part of the lower case; and while the upper side installation part of the upper case is positioned inside the insertion hole of the key-connecting part of the keyboard unit and mates with the lower side installation part, inserting a fastening member into the upper side installation part and the lower side installation part to fix the upper case to the lower case via the fastening member.

Abstract: A keyboard instrument includes a keyboard unit including a key-connecting part to which a plurality of keys are connected; and a lower case having a pedestal and a supporting part on the pedestal, the supporting part vertically protruding from an upper surface of the pedestal, wherein the key-connecting part is directly mounted on an upper portion of the supporting part.

Abstract: A method for assembling a keyboard instrument includes installing a keyboard unit on a lower case such that an insertion hole of a key-connecting part of the keyboard unit is positioned corresponding to a lower side installation part of the lower case; thereafter, placing a upper case on the keyboard unit such that an upper side installation part of the upper case is positioned inside the insertion hole of the key-connecting part of the keyboard unit and mates with the lower side installation part of the lower case; and while the upper side installation part of the upper case is positioned inside the insertion hole of the key-connecting part of the keyboard unit and mates with the lower side installation part, inserting a fastening member into the upper side installation part and the lower side installation part to fix the upper case to the lower case via the fastening member.

Abstract: A keyboard instrument includes an upper case having an upper side installation part; a lower case having a lower side installation part at a position corresponding to the upper side installation part of the upper case; a keyboard unit including a key-connecting part to which a plurality of keys are connected, the key-connecting part having an insertion hole to which at least one of the upper side installation part and the lower side installation part is inserted; and a fastening member fastening the upper side installation part and the lower side installation part together.

Abstract: A keyboard instrument includes an upper case having an upper side installation part; a lower case having a lower side installation part at a position corresponding to the upper side installation part of the upper case; a keyboard unit including a key-connecting part to which a plurality of keys are connected, the key-connecting part having an insertion hole to which at least one of the upper side installation part and the lower side installation part is inserted; and a fastening member fastening the upper side installation part and the lower side installation part together.

Abstract: A keyboard instrument includes a keyboard unit including a key-connecting part to which a plurality of keys are connected; and a lower case having a pedestal and a supporting part on the pedestal, the supporting part vertically protruding from an upper surface of the pedestal, wherein the key-connecting part is directly mounted on an upper portion of the supporting part.

Abstract: A keyboard instrument includes a plurality of key blocks, each including key main bodies, connecting sections, and a supporting section. Each key main body has a top surface that can be pressed by a user to play the keyboard instrument. Each connecting section extends from a key main body and deforms in response to pressing at the top surface of the key main body. The supporting section supports the key main bodies as one key block through the connecting sections. The key blocks are stacked at the supporting section in an instrument case so that a plurality of connecting sections of one key block and a plurality of connecting sections of another key block overlap each other. In at least one key block, each connecting section extends from a top surface side of the corresponding key main body.

Abstract: A keyboard instrument including a plurality of keys and a keyboard chassis, in which each key has a shaft or a shaft hole provided on one end side thereof. The keyboard chassis is provided with shafts when the plurality of keys has shaft holes, and is provided with shaft holes when the plurality of keys has shafts. This keyboard chassis supports the plurality of keys by the shafts being arranged in the shaft holes. Also, first spaces and second spaces are formed between an inner surface of the shaft hole and the shaft. The first spaces are positioned in a vertical direction of the key, and the second spaces are positioned in a longitudinal direction of the key. In addition, the second spaces are larger than the first spaces.

Abstract: A keyboard instrument including a hammer unit which includes a plurality of hammer members each of which has an effort point provided on one end side, a load point provided on an other end side, and a fulcrum provided between the effort point and the load point, and a hammer holder which rotatably holds the plurality of hammer members, and a keyboard chassis which includes a restriction member for restricting rotations of the plurality of hammer members performed in response to key depression operations within a restriction range and in which the hammer unit is mounted, in which the hammer holder has a plurality of contact points on the effort point side which comes in contact with portions of the plurality of hammer members on the effort point side when the hammer unit is in a vertically inverted state.

Abstract: A keyboard instrument including a hammer unit which includes a plurality of hammer members each of which has an effort point provided on one end side, a load point provided on an other end side, and a fulcrum provided between the effort point and the load point, and a hammer holder which rotatably holds the plurality of hammer members, and a keyboard chassis which includes a restriction member for restricting rotations of the plurality of hammer members performed in response to key depression operations within a restriction range and in which the hammer unit is mounted, in which the hammer holder has a plurality of contact points on the effort point side which comes in contact with portions of the plurality of hammer members on the effort point side when the hammer unit is in a vertically inverted state.

Abstract: A keyboard instrument includes a plurality of key blocks, each including key main bodies, connecting sections, and a supporting section. Each key main body has a top surface that can be pressed by a user to play the keyboard instrument. Each connecting section extends from a key main body and deforms in response to pressing at the top surface of the key main body. The supporting section supports the key main bodies as one key block through the connecting sections. The key blocks are stacked at the supporting section in an instrument case so that a plurality of connecting sections of one key block and a plurality of connecting sections of another key block overlap each other. In at least one key block, each connecting section extends from a top surface side of the corresponding key main body.

Abstract: A keyboard instrument including a plurality of keys and a keyboard chassis, in which each key has a shaft or a shaft hole provided on one end side thereof. The keyboard chassis is provided with shafts when the plurality of keys has shaft holes, and is provided with shaft holes when the plurality of keys has shafts. This keyboard chassis supports the plurality of keys by the shafts being arranged in the shaft holes. Also, first spaces and second spaces are formed between an inner surface of the shaft hole and the shaft. The first spaces are positioned in a vertical direction of the key, and the second spaces are positioned in a longitudinal direction of the key. In addition, the second spaces are larger than the first spaces.

Abstract: A keyboard instrument includes a plurality of key blocks, and an instrument case. Each key block includes, a plurality of key main bodies, an area of the top surface abutting one edge side of the key main body in a longitudinal direction is pressed by a user; a plurality of connecting sections, the connecting section is deformed in response to be pressed by the user; and a supporting section which supports the plurality of key main bodies as one key block through the plurality of connecting sections. The plurality of supporting sections included in the plurality of key blocks are piled up in a direction intersecting with the longitudinal direction in the instrument case. The plurality of connecting sections included in one key block and the plurality of connecting sections included in another key block are overlapped each other in the instrument case.

Abstract: A hammer unit for use in a keyboard device or the like includes a plurality of hammer arms which are respectively operated in response to key depression operations on a plurality of keys, and a hammer connecting section which has a length corresponding to array of the plurality of keys, is connected to the plurality of hammer arms to support the plurality of hammer arms in an arrayed state, and has mounting sections which are provided in a direction of the array in areas where the hammer arms are not connected, and by which the hammer connecting section is mounted to a keyboard chassis. As a result, the assembling workability is improved.